I’m having this same issue on Minecraft Bedrock 1.21.121 with Windows 10.
The mouse keeps moving out of the game window or acting weird when I play.
I already tried reinstalling, updating drivers, and turning off fullscreen, but nothing helped.
Hope this gets fixed soon, it’s really annoying.
Abdullah M
I’m having this same issue on Minecraft Bedrock 1.21.121 with Windows 10.
The mouse keeps moving out of the game window or acting weird when I play.
I already tried reinstalling, updating drivers, and turning off fullscreen, but nothing helped.
Hope this gets fixed soon, it’s really annoying.