Ah, now I see!
If Run In Background is disabled in newer versions of Unity, while things like physics still run if only scene view is open, text freezes. In-editor, the application is only "focused" if the game view has focus. I was worried about this breaking behaviour, but it looks like tabbing out of the editor window and back in seems to work as expected anyway? Well, mostly-expected... text still skips forward a bit when the application resumes. I'll push this for the next update.
If you want to have the behaviour change now, all I did was change OnApplicationFocus() to this:
void OnApplicationFocus(bool focused)
{
#if !UNITY_EDITOR
if(!Application.runInBackground)
{
applicationFocused = focused;
}
#endif
}