diff --git a/.github/workflows/lts-backport.yaml b/.github/workflows/lts-backport.yaml
index 376b8817b35e..9f5bb992440b 100644
--- a/.github/workflows/lts-backport.yaml
+++ b/.github/workflows/lts-backport.yaml
@@ -16,7 +16,7 @@ jobs:
         with:
           fetch-depth: 0
       - uses: coursier/cache-action@v6
-      - uses: VirtusLab/scala-cli-setup@v1.8.4
+      - uses: VirtusLab/scala-cli-setup@v1.9.1
       - run: scala-cli ./project/scripts/addToBackportingProject.scala -- ${{ github.sha }}
         env:
           GRAPHQL_API_TOKEN: ${{ secrets.GRAPHQL_API_TOKEN }}
diff --git a/compiler/src/dotty/tools/dotc/core/SymDenotations.scala b/compiler/src/dotty/tools/dotc/core/SymDenotations.scala
index 74a125e2a41e..b6e8dc9a2c76 100644
--- a/compiler/src/dotty/tools/dotc/core/SymDenotations.scala
+++ b/compiler/src/dotty/tools/dotc/core/SymDenotations.scala
@@ -1220,7 +1220,7 @@ object SymDenotations {
       || is(Inline, butNot = Deferred)
       || is(JavaDefinedVal, butNot = Method)
       || isConstructor
-      || !owner.isExtensibleClass && !is(Deferred)
+      || exists && !owner.isExtensibleClass && !is(Deferred)
       	// Deferred symbols can arise through parent refinements under x.modularity.
       	// For them, the overriding relationship reverses anyway, so
       	// being in a final class does not mean the symbol cannot be
diff --git a/tests/neg/i23637.check b/tests/neg/i23637.check
new file mode 100644
index 000000000000..d568c04a31b7
--- /dev/null
+++ b/tests/neg/i23637.check
@@ -0,0 +1,6 @@
+-- [E083] Type Error: tests/neg/i23637.scala:6:9 -----------------------------------------------------------------------
+6 |  export foo.pin.* // error: (because we need reflection to get at foo.pin)
+  |         ^^^^^^^
+  |         (Test.foo.pin : Object) is not a valid export prefix, since it is not an immutable path
+  |
+  | longer explanation available when compiling with `-explain`