Game Freeze on particular spot during gameplay

[placeboyue]

I know a particular game freezing on a particular spot wouldn't be a priority (and i don't know if you're even still working on these emulators) but perhaps it gives light on a deeper underlying issue that's worth fixing, i hope.

The game "Battletoads & double dragon - The Ultimate Team" freezes when entering stage 5-2. Stages are like checkpoints on the middle of a level, and whenever you set foot in the pixel that's supposed to trigger it, everything freezes.
I tried to emulate the same spot on QuickNES core of retroarch and it runs past this spot, so it's a problem with this emulator, not the rom.

In case you wanna test it, there's a faster way to reach the problematic level, using a secret Warp zone menu. You could either select level 5-1 and play a few minutes to reach the spot, or select 5-2 and see the game immediately crash

"At the player selection screen, press B, A, Down, B, Up and Down (A sound will confirm cheat input was ok).
Select your character and press Start. If done right, you'll be at the Super Warp Zone menu."