I've noticed now that either with this fix, or the YUSUPLAZ code patched to the full ROM (YUSLALAZ is for the incomplete version I found out), after I start a game, it skips past the first level select screen. Like it auto-selects and I have to start at the next level select screen. This doesn't happen with the unpatched ROM.
I've tested it on Nestopia on PC, and NES.emu on Android, same results. Not sure what's up with this.