No idea if it will help you here, but everytime someone mentions to me they are having display output issues and they’re using Wayland and an Nvidia GPU, I recommend trying X to see if problem persists or not. If it doesn’t, I would suspect the GPU driver, but that is a VERY uninformed guess. Lol
I dual booted a machine and I had to even unplug my windows drive to get it to install a Linux distro on the other drive. Windows really does not like playing nice with dual boot systems so it is always best to keep Windows on its own drive.