Nobody reported before because is a bug of the last live update.
Please re-read my reply.
I said, "the only place where we use the mouse in P3D 5, is the QuickEdit editor", but you never said if you ever used it. If you had, I could confirm that yes, it's something that happened recently and, of course, as you can see from other posts, there's already a new fix for this in the current Live Update.
If, instead, you are not using Quickedit and you are still having this problem, then we need a whole new different kind of troubleshooting, because I really can't see how pushback in general (outside QuickEdit) could be related to the mouse or the joystick.