Hello,
I'm having same-ish bug here with chrome windows.
Basically if I have several Chrome windows in one Groupy,
then after unknown trigger, if I try to move Chrome tabs between themself it will rapidly switch between Chrome windows...
I tried same in incognito mode, and it triggered there too, after bit of coaxing and switching between those chrome windows, unfortunatelly I didn't have recording up, nor I managed to re-trigger. Another variation(?) of the bug popped up though on another try, here: https://puu.sh/DbGCC/1f6f620ba9.mp4 (note the tabs switching from B to A)
Fun fact: if a Groupy window has incognito windows + one normal, then it will simply eject the window as shown here: https://puu.sh/DbGEg/3b03790542.mp4
In my normal usage, this bug triggers everytime I try to move chrome tab. Also of note might be, that this doesn't happen if 2 Chromes are just stacked on top of each other, only if they are in same Groupy window.
TL;DR: same bug, yes triggered in incognito too (needed a few switches between them), triggered a variation on video
Roukanken