that's it. But afaik, you cannot do anything against that (unless you try to spot the problematic statements by parsing the code, or try to redefine all the bad stuff, but it very quickly goes out of hands and mostly is pointless because someone wanting to cheat will always find a way, especially in python).

*************************
*  MANUAL NOTIFICATION  *
*       SEE ABOVE       *
*************************

Indeed there is something very weird going on.
At first I thought I let you meddle with the original input maze, but it correctly deepcopied. It seems like I don't actually ever get the hand back from your solution, it won't even print anything! o_O
I'll investigate, thanks for the feedback!