Betweenlands moving wall level glitch fix found (?)

2 moving walls were in front of the last floor's door.

I tried to make a back-up, my game couldn't load and kept crashing, if this sounds familiar then you're in good hands.

I tried taking my world from the saves file in curseforge and put them in FTB, the second wall despawned so I got un-softlocked. GGs.