This bug persists prior to Photon, but I’m really hoping you can fix it within Photon.
Whenever you get a new chat window the window stack defaults to light mode (semi-transparent background). AFAIK this issue only affects dark mode users, but it’s a real pain.
Please make it so that the window stack honours your setting on the existing chat channel(s).
EBR-236217
Pictures included in EBR.