IDEA-86810 Find Usages not finding usages when I do it on decompiled stub source

java/java-tests/testData/psi/search/findUsages/libraryClassUsageFromDecompiledSource/Usage.java

@@ -0,0 +1,5 @@
+import javax.swing.JLabel;
+
+public class Usage {
+  JLabel s;
+}

java/java-tests/testSrc/com/intellij/psi/search/FindUsagesTest.java

@@ -89,6 +89,12 @@ public class FindUsagesTest extends PsiTestCase{
     assertEquals(1, ReferencesSearch.search(method).findAll().size());
   }
 
+  public void testLibraryClassUsageFromDecompiledSource() {
+    PsiElement decompiled =
+      ((PsiCompiledElement)myJavaFacade.findClass("javax.swing.JLabel", GlobalSearchScope.allScope(myProject))).getMirror();
+    assertEquals(2, ReferencesSearch.search(decompiled).findAll().size());
+  }
+
   public void testImplicitConstructorUsage() throws Throwable {
     PsiMethod[] ctrs = myJavaFacade.findClass("Foo", GlobalSearchScope.allScope(myProject)).getConstructors();
     PsiMethod method = ctrs[0];