Update

Author: changvvb

compiler/src/dotty/tools/dotc/transform/ExplicitOuter.scala

@@ -247,7 +247,7 @@ object ExplicitOuter {
 
   /** Class constructor takes an outer argument. Can be called only after phase ExplicitOuter. */
   def hasOuterParam(cls: ClassSymbol)(using Context): Boolean =
-    !cls.is(Trait) && needsOuterIfReferenced(cls)
+    !cls.is(Trait) && needsOuterAlways(cls)
 
   /** Tree references an outer class of `cls` which is not a static owner.
    */

tests/run/10838/A.java

@@ -1,3 +1,3 @@
 public class A {
   public class B {}
-}
+}

tests/run/10838/Test.scala

@@ -3,4 +3,4 @@ object Test {
     val a = new A
     new a.B
   }
-}
+}