src/jdk.jpackage/macosx/classes/jdk/jpackage/internal/MacDmgBundler.java

*** 464,469 ****
--- 464,475 ----
              return true;
          } catch (Exception e) {
              return false;
          }
      }
+ 
+     @Override
+     public boolean isDefault() {
+         return true;
+     }
+ 
  }