Adobe "Prepare Form" does not recognize a "square" intended for use as a "check-box".
I am presently using TeXstudio 4.0.0 (git 4.0.0), configured to use 'Lualatex" for creating PDF documents and forms. Up to a point, that works fine. Adobe "Prepare Form" can recognize most fields correctly. However, it fails to acknowledge "squares" intended to be used as "check-boxes" automatically. It completely ignores them.
I have tried several different "font packages" I am presently using the "bbding" package, but that should not be the cause of the problem since other font packages are not being correctly recognized either.
Once upon a time, several years ago, Adobe worked correctly. Therefore, I believe it is a regression bug. I have no idea how to get the Adobe engineers to look into this problem. I would welcome any assistance available.