I too am seeing this. I can set cusom colours to tabs, save the group, then upon restart, custom colours no longer present. System was Windows 10 x64, fully-patched. Now upgraded to Windows 11 x64, fully-patched and still doing it.
Microsoft Edge, loaded in InPrivate mode, has been saved into a group with a couple of other tabs. Following a restart, loading the group does load Edge, yes, but not in InPrivate mode. System is W10 x64, fully patched as of 22/11, and with Groupy V2.2
I think that it's been mentioned before, but I'd just like to add my support for the request to add an 'On top of other Windows' feature, so that Fences roll out (from either top, bottom or side) over the top of any other windows already open. It's a pain having a fence roll down from the top of the screen, only to have the icon for program you need obscured by another window already onscreen. <img src="https://cdn.stardock.us/forums/19/2/1902784/69304056-f410-48af-aee8-cb175e84