Indeed. Looks like snapping feature is blocked. Thank you!Tried this, but doesn't work as expected. Try it yourself by dragging the window up and down. It does only affect RadioBOSS windows.
It reproduced here on a clean Windows 11 installation.Conclusion: If the problem can't be reproduced, I'll just always run RadioBOSS maximized so I don't get upset about it. Not a big deal.