src/jdk.compiler/share/classes/com/sun/tools/javac/code/Preview.java

*** 160,10 ***
--- 160,15 ---
      }
  
      /**
       * Report usage of a preview feature. Usages reported through this method will affect the
       * set of sourcefiles with dependencies on preview features.
+      * <p>
+      * If the source code does not use a preview language feature, but when preview features
+      * are enabled, a different translation strategy is used and the resulting classfile
+      * depends on preview features, we can just {@link #markUsesPreview} silently.
+      *
       * @param flag a flag to set on the diagnostic
       * @param pos the position at which the preview feature was used.
       * @param feature the preview feature used.
       */
      public void warnPreview(DiagnosticFlag flag, DiagnosticPosition pos, Feature feature) {

*** 213,10 ***
--- 218,11 ---
       * @return true, if given feature is a preview feature.
       */
      public boolean isPreview(Feature feature) {
          return switch (feature) {
              case PRIMITIVE_PATTERNS -> true;
+             case VALUE_CLASSES -> true;
              //Note: this is a backdoor which allows to optionally treat all features as 'preview' (for testing).
              //When real preview features will be added, this method can be implemented to return 'true'
              //for those selected features, and 'false' for all the others.
              default -> forcePreview;
          };