backport: Also backport missing scala#18893

Author: tgodzik

compiler/src/dotty/tools/dotc/core/NamerOps.scala

@@ -113,8 +113,11 @@ object NamerOps:
       var flags = ApplyProxyFlags | (constr.flagsUNSAFE & AccessFlags)
       if cls.is(Protected) && !modcls.is(Protected) then flags |= Protected
       newSymbol(
-        modcls, nme.apply, flags,
-        ApplyProxyCompleter(constr), coord = constr.coord)
+        modcls, nme.apply,
+        flags,
+        ApplyProxyCompleter(constr),
+        cls.privateWithin,
+        constr.coord)
     for dcl <- cls.info.decls do
       if dcl.isConstructor then scope.enter(proxy(dcl))
     scope

tests/pos/i22560b/client_2.scala

@@ -14,4 +14,4 @@ package companioned:
 
 package p:
 
-  def f = internal.P(42)
+  def f = new internal.P(42)