Your comments

I couldn't make the option work for explorer, it seems to always run as non-administrator.
Are you running the tweaker as administrator, too? Do you see any error message?

The issue of the tweaker silently failing to inject should be fixed in v4.2.3.

There's a bug in Windows which may cause unresponsive windows to move to the right end of the taskbar/group. Maybe this is the cause for the behavior you're seeing.

I do not think it's a bug of the tweaker. You might want to try running with it turned off, and see if the issue still occurs.
I'll try to come up with a workaround.
Meanwhile, I'm tagging it as "not a bug" as it's no a bug of the tweaker.