Custom event freezing

I figured it out! It turned out that my problem was not the code I posted here, but rather a wrong byte after the jump to this code! Since the event banks in the vanilla game are pretty full, the only way to create more room for new/longer events is to use B2 jumps to some empty space of an expanded rom, and that's what I did. But I completely forgot that in this case, the FE command doesn't automatically end the entire event, but rather returns to the previous location in the rom right after the B2 jump. And the byte following that turned out to be an FF instead of an FE. After fixing this, everything worked smoothly. Turns out it was a simple 1-byte fix again.

Just thought I'd post this here in case someone else encounters the same issue again. Anyway thanks for your help Gi Nattak!