I think it's gotta be... since it has an internal timer, when it's set to ignore time scale and you move out of the window, the internal timer counts up based on the delta time, the last time since the previous frame. So it keeps counting, even when the window is in the background (and the app is set to not run in the background)
This isn't the intended behaviour of ignore time scale (its for animated effects on pause menus, really) so I should either change the way STM counts up time (Use Time.time - timestarted) or make a special bool that checks whether the window is focused or not. The first option wouldn't be the best, since meshes can have variable read speeds, so I'll try the second.
Yep, got it working!! This fix will be in v1.5.2. Thanks!