What happens if you remove the gaps between windows? Just guessing, but maybe the bug simply takes the gap width and uses it for the inner padding? I don’t use gaps at all and I’ve never experienced this issue. (Docs: https://i3wm.org/docs/userguide.html#gaps)
Thanks for sharing. So there is no option to change the Win key in Blender4, to use (for example) AltGr (right Alt) instead?