Hello, teammates. I get this bug first time on 4.19, and it keeps repeating over and over again. I’ve also started a new project on android so it can be related to touch control. And my thread pause on any None, some checkbox in editor settings. So with all of this, I encounter the bug almost every time when I playing in the viewport and some part of code pausing game because of none (or breakpoint), after resuming I cannot longer move in an editor with the right mouse button.
The temporal solution for me is to start another simulating in new PIE window and after closing it engine sometimes restores full mouse control in an editor. So next time try to start your projects in different instances and windows and see if it will heal your control and try to look if this bug related to touch control, touch mouse simulating or breakpoints