Tab bar invisible after leaving fullscreen video (Firefox and Chrome)

Windows Version Number: Windows 11 26H2
App Version: Groupy 2.31

Bug happens in both Firefox and Chrome.

Steps:
1. Have a maximized group with a couple of browser windows
2. Play a video in the active tab and go fullscreen
   (any video works, e.g. https://commons.wikimedia.org/wiki/File:Big_Buck_Bunny_4K.webm)
3. Exit fullscreen

The window comes back fine but the Groupy tab bar is transparent. The space for it is there, the tabs are just not drawn.

It comes back as soon as I do any of these:
- hover the mouse over where the bar should be
- click another window or alt-tab away

So it looks like the bar is shown again in the right place after fullscreen but never gets repainted, and anything that makes Groupy redraw the tabs fixes it. The tab title changing seems to bring it back too.

Happens pretty much every time for me. Thanks