Bug? B4A v6.50 beta #2 - Designer save changes

1. Create empty B4A project and save it
2. Open designer, add button, save changes and close designer
3. Open designer then open last saved .bal
4. Delete button and click on close

On step 4. designer need to offer to save changes or not, but in my case, just close it self.

This issue (which is not new) will only happen when the layout is identical to a newly created layout. It will most probably never happen in real usage.