If you can build a solid case for the bug, I suggest you take it up with the developer at sup...@MementoDatabase.com. I think 4.12.0 is still in beta testing, so make sure to tell him if you are using the beta code or the base release code.
Also the normal stuff we always advise, like edition (mobile or desktop), platform (Windows, macOS, Linux, Android, or iOS), release (from Help About), and anything else you can think of that might help him pin down what the problem is.
And of course, all scenarios you know of that show the various aspects of your problem.