[Rep+] Co-op Game Crashes at End of Game After Leaving any Final Boss. Lose all Progress to Stamps.

[Dawsonavme]

Steps to reproduce (Not guaranteed 100% of the time):

For context my brother and I play co-op together often. He plays on mouse and keyboard and I use a PS4 controller. He hosts the game and I join him. We get this same crash I would say 70% of the time. Obviously no mods are used because they are not allowed in Coop.

Once we finish the end of the game and go into the chest after beating any final boss I crash and lose any progress to stamps that would have been gained from completion meaning I have to do it all over again to get the stamps.

Additional notes:
I’ve attached a video clip and the crash dump log below. From reading the log (though I don’t fully understand it), it appears the game enters a loop where it fails to associate a player entity with my controller device during the transition into the co-op mini-game at the end.

Example:

TheBindingOfIssacCrash.mp4

As seen in the clip above I enter the chest and it transitions into a black screen and crashes to desktop.

Crash Dump Log:

isaacv1.9.7.15.J374-20260126-092253-28488-24560.txt