Thanks for sending that over. We currently don't support the bluetooth icon on DisplayFusion taskbars in Windows 11, I think it's only appearing because you have Start11 installed. I would guess there's a setting somewhere in there that's causing it to turn black as well.
Thanks for sending that over. This is difficult to fix without being able to reproduce it locally, but we have some changes coming for v11 beta 1 that might fix this up. We'll let you know once we have a new beta to test out.