diff --git a/src/core/lombok/eclipse/handlers/HandleConstructor.java b/src/core/lombok/eclipse/handlers/HandleConstructor.java
index 9229fbe7..5ad15315 100755
--- a/src/core/lombok/eclipse/handlers/HandleConstructor.java
+++ b/src/core/lombok/eclipse/handlers/HandleConstructor.java
@@ -252,7 +252,7 @@ public class HandleConstructor {
 			
 		ASTNode source = sourceNode.get();
 		boolean staticConstrRequired = staticName != null && !staticName.equals("");
-
+		
 		if (skipIfConstructorExists != SkipIfConstructorExists.NO) {
 			for (EclipseNode child : typeNode.down()) {
 				if (child.getKind() == Kind.ANNOTATION) {
diff --git a/src/core/lombok/javac/handlers/HandleSuperBuilder.java b/src/core/lombok/javac/handlers/HandleSuperBuilder.java
index 6ff096fd..c971a10f 100644
--- a/src/core/lombok/javac/handlers/HandleSuperBuilder.java
+++ b/src/core/lombok/javac/handlers/HandleSuperBuilder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013-2025 The Project Lombok Authors.
+ * Copyright (C) 2013-2026 The Project Lombok Authors.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -269,6 +269,7 @@ public class HandleSuperBuilder extends JavacAnnotationHandler<SuperBuilder> {
 			String superclassBuilderClassName = job.replaceBuilderClassName(superclassName.toString(), builderClassNameTemplate);
 			superclassBuilderClass = chainDots(parent, superclassName.toString(), superclassBuilderClassName);
 		} else if (extendsClause != null) {
+			// This is dangerous; `toString()` breaks on non-ascii. We should optimally never get here. This fallback mechanism will remain (better than hardcrash; `toString()` is likely to work in _some_ cases).
 			String builderClassNameTemplate = BuilderJob.getBuilderClassNameTemplate(annotationNode, null);
 			String superclassBuilderClassName = job.replaceBuilderClassName(extendsClause.toString(), builderClassNameTemplate);
 			superclassBuilderClass = chainDots(parent, extendsClause.toString(), superclassBuilderClassName);
diff --git a/test/transform/resource/after-delombok/SuperBuilderNonAsciiComplex.java b/test/transform/resource/after-delombok/SuperBuilderNonAsciiComplex.java
new file mode 100644
index 00000000..b023684a
--- /dev/null
+++ b/test/transform/resource/after-delombok/SuperBuilderNonAsciiComplex.java
@@ -0,0 +1,144 @@
+public class SuperBuilderNonAsciiComplex {
+	public static class 부모<T> {
+		Long a;
+		T z;
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		public static abstract class 부모Builder<T, C extends SuperBuilderNonAsciiComplex.부모<T>, B extends SuperBuilderNonAsciiComplex.부모.부모Builder<T, C, B>> {
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			private Long a;
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			private T z;
+			/**
+			 * @return {@code this}.
+			 */
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public B a(final Long a) {
+				this.a = a;
+				return self();
+			}
+			/**
+			 * @return {@code this}.
+			 */
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public B z(final T z) {
+				this.z = z;
+				return self();
+			}
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			protected abstract B self();
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public abstract C build();
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public java.lang.String toString() {
+				return "SuperBuilderNonAsciiComplex.부모.부모Builder(a=" + this.a + ", z=" + this.z + ")";
+			}
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		private static final class 부모BuilderImpl<T> extends SuperBuilderNonAsciiComplex.부모.부모Builder<T, SuperBuilderNonAsciiComplex.부모<T>, SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T>> {
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			private 부모BuilderImpl() {
+			}
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			protected SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T> self() {
+				return this;
+			}
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public SuperBuilderNonAsciiComplex.부모<T> build() {
+				return new SuperBuilderNonAsciiComplex.부모<T>(this);
+			}
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		protected 부모(final SuperBuilderNonAsciiComplex.부모.부모Builder<T, ?, ?> b) {
+			this.a = b.a;
+			this.z = b.z;
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		public static <T> SuperBuilderNonAsciiComplex.부모.부모Builder<T, ?, ?> builder() {
+			return new SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T>();
+		}
+	}
+	public static class 자식 extends SuperBuilderNonAsciiComplex.부모<String> {
+		String b;
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		public static abstract class 자식Builder<C extends SuperBuilderNonAsciiComplex.자식, B extends SuperBuilderNonAsciiComplex.자식.자식Builder<C, B>> extends SuperBuilderNonAsciiComplex.부모.부모Builder<String, C, B> {
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			private String b;
+			/**
+			 * @return {@code this}.
+			 */
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public B b(final String b) {
+				this.b = b;
+				return self();
+			}
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			protected abstract B self();
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public abstract C build();
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public java.lang.String toString() {
+				return "SuperBuilderNonAsciiComplex.자식.자식Builder(super=" + super.toString() + ", b=" + this.b + ")";
+			}
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		private static final class 자식BuilderImpl extends SuperBuilderNonAsciiComplex.자식.자식Builder<SuperBuilderNonAsciiComplex.자식, SuperBuilderNonAsciiComplex.자식.자식BuilderImpl> {
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			private 자식BuilderImpl() {
+			}
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			protected SuperBuilderNonAsciiComplex.자식.자식BuilderImpl self() {
+				return this;
+			}
+			@java.lang.Override
+			@java.lang.SuppressWarnings("all")
+			@lombok.Generated
+			public SuperBuilderNonAsciiComplex.자식 build() {
+				return new SuperBuilderNonAsciiComplex.자식(this);
+			}
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		protected 자식(final SuperBuilderNonAsciiComplex.자식.자식Builder<?, ?> b) {
+			super(b);
+			this.b = b.b;
+		}
+		@java.lang.SuppressWarnings("all")
+		@lombok.Generated
+		public static SuperBuilderNonAsciiComplex.자식.자식Builder<?, ?> builder() {
+			return new SuperBuilderNonAsciiComplex.자식.자식BuilderImpl();
+		}
+	}
+	public static void test() {
+		부모<String> x = 자식.builder().b("").a(5L).build();
+	}
+}
\ No newline at end of file
diff --git a/test/transform/resource/after-ecj/SuperBuilderNonAsciiComplex.java b/test/transform/resource/after-ecj/SuperBuilderNonAsciiComplex.java
new file mode 100644
index 00000000..3de4ac98
--- /dev/null
+++ b/test/transform/resource/after-ecj/SuperBuilderNonAsciiComplex.java
@@ -0,0 +1,96 @@
+public class SuperBuilderNonAsciiComplex {
+  public static @lombok.SuperBuilder class 부모<T> {
+    public static abstract @java.lang.SuppressWarnings("all") @lombok.Generated class 부모Builder<T, C extends SuperBuilderNonAsciiComplex.부모<T>, B extends SuperBuilderNonAsciiComplex.부모.부모Builder<T, C, B>> {
+      private @java.lang.SuppressWarnings("all") @lombok.Generated Long a;
+      private @java.lang.SuppressWarnings("all") @lombok.Generated T z;
+      public 부모Builder() {
+        super();
+      }
+      /**
+       * @return {@code this}.
+       */
+      public @java.lang.SuppressWarnings("all") @lombok.Generated B a(final Long a) {
+        this.a = a;
+        return self();
+      }
+      /**
+       * @return {@code this}.
+       */
+      public @java.lang.SuppressWarnings("all") @lombok.Generated B z(final T z) {
+        this.z = z;
+        return self();
+      }
+      protected abstract @java.lang.SuppressWarnings("all") @lombok.Generated B self();
+      public abstract @java.lang.SuppressWarnings("all") @lombok.Generated C build();
+      public @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated java.lang.String toString() {
+        return (((("SuperBuilderNonAsciiComplex.부모.부모Builder(a=" + this.a) + ", z=") + this.z) + ")");
+      }
+    }
+    private static final @java.lang.SuppressWarnings("all") @lombok.Generated class 부모BuilderImpl<T> extends SuperBuilderNonAsciiComplex.부모.부모Builder<T, SuperBuilderNonAsciiComplex.부모<T>, SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T>> {
+      private 부모BuilderImpl() {
+        super();
+      }
+      protected @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T> self() {
+        return this;
+      }
+      public @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated SuperBuilderNonAsciiComplex.부모<T> build() {
+        return new SuperBuilderNonAsciiComplex.부모<T>(this);
+      }
+    }
+    Long a;
+    T z;
+    protected @java.lang.SuppressWarnings("all") @lombok.Generated 부모(final SuperBuilderNonAsciiComplex.부모.부모Builder<T, ?, ?> b) {
+      super();
+      this.a = b.a;
+      this.z = b.z;
+    }
+    public static @java.lang.SuppressWarnings("all") @lombok.Generated <T>SuperBuilderNonAsciiComplex.부모.부모Builder<T, ?, ?> builder() {
+      return new SuperBuilderNonAsciiComplex.부모.부모BuilderImpl<T>();
+    }
+  }
+  public static @lombok.SuperBuilder class 자식 extends SuperBuilderNonAsciiComplex.부모<String> {
+    public static abstract @java.lang.SuppressWarnings("all") @lombok.Generated class 자식Builder<C extends SuperBuilderNonAsciiComplex.자식, B extends SuperBuilderNonAsciiComplex.자식.자식Builder<C, B>> extends SuperBuilderNonAsciiComplex.부모.부모Builder<String, C, B> {
+      private @java.lang.SuppressWarnings("all") @lombok.Generated String b;
+      public 자식Builder() {
+        super();
+      }
+      /**
+       * @return {@code this}.
+       */
+      public @java.lang.SuppressWarnings("all") @lombok.Generated B b(final String b) {
+        this.b = b;
+        return self();
+      }
+      protected abstract @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated B self();
+      public abstract @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated C build();
+      public @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated java.lang.String toString() {
+        return (((("SuperBuilderNonAsciiComplex.자식.자식Builder(super=" + super.toString()) + ", b=") + this.b) + ")");
+      }
+    }
+    private static final @java.lang.SuppressWarnings("all") @lombok.Generated class 자식BuilderImpl extends SuperBuilderNonAsciiComplex.자식.자식Builder<SuperBuilderNonAsciiComplex.자식, SuperBuilderNonAsciiComplex.자식.자식BuilderImpl> {
+      private 자식BuilderImpl() {
+        super();
+      }
+      protected @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated SuperBuilderNonAsciiComplex.자식.자식BuilderImpl self() {
+        return this;
+      }
+      public @java.lang.Override @java.lang.SuppressWarnings("all") @lombok.Generated SuperBuilderNonAsciiComplex.자식 build() {
+        return new SuperBuilderNonAsciiComplex.자식(this);
+      }
+    }
+    String b;
+    protected @java.lang.SuppressWarnings("all") @lombok.Generated 자식(final SuperBuilderNonAsciiComplex.자식.자식Builder<?, ?> b) {
+      super(b);
+      this.b = b.b;
+    }
+    public static @java.lang.SuppressWarnings("all") @lombok.Generated SuperBuilderNonAsciiComplex.자식.자식Builder<?, ?> builder() {
+      return new SuperBuilderNonAsciiComplex.자식.자식BuilderImpl();
+    }
+  }
+  public SuperBuilderNonAsciiComplex() {
+    super();
+  }
+  public static void test() {
+    부모<String> x = 자식.builder().b("").a(5L).build();
+  }
+}
diff --git a/test/transform/resource/before/SuperBuilderNonAsciiComplex.java b/test/transform/resource/before/SuperBuilderNonAsciiComplex.java
new file mode 100644
index 00000000..51e26757
--- /dev/null
+++ b/test/transform/resource/before/SuperBuilderNonAsciiComplex.java
@@ -0,0 +1,16 @@
+public class SuperBuilderNonAsciiComplex {
+	@lombok.SuperBuilder
+	public static class 부모<T> {
+		Long a;
+		T z;
+	}
+	
+	@lombok.SuperBuilder
+	public static class 자식 extends SuperBuilderNonAsciiComplex.부모<String> {
+		String b;
+	}
+	
+	public static void test() {
+		부모<String> x = 자식.builder().b("").a(5L).build();
+	}
+}