Trying to Troubleshoot a Convergence/Seamless Issue

So

My partner and I were playing Convergence with Seamless co-op. Everything was going well enough aside from some light jank here and there.

Then we got to Radahn

So Seamless Convergence doesn't seem to work here. It kept crashing the game. This, believe it or not, isn't the problem. The problem arose when we kept trying to see if it would work. Eventually, my partner's game crashed and then she simply couldn't get Convergence to open anymore. I could, though. I spent a bunch of time trying to troubleshoot the problem (reinstalled Convergence and Seamless, tried moving some files around, checked file integrity through Steam, stuff like that), and I was able to get Convergence to open if Seamless Co-op isn't within the Convergence folder. However, Seamless just... doesn't work anymore. If you try to open the game with it installed, the game immediately crashes. It doesn't seem to be tied to any specific save files, as I tried removing them and starting from scratch, but it still won't open. It's worth mentioning I WAS able to get the Seamless save file to open with Convergence, but just not with Seamless active. I even had my partner beat Radahn solo and leave the area to see if somehow that was related. It wasn't, but that's just how out of ideas I am at this point. My partner tried looking for insight on the Convergence Discord but she only got vague answers like "Seamless has problems right now", so hopefully someone here might have some ideas. Please let us know, thanks!