Crashing in the nether

I play on windows, switch, and primarily on xbox series x. Within my realm I recently began a extended stay within the nether. At first gameplay was fine but about 2 days before the mounts of mayhem update I began noticing lag when opening chest and other interactions. I looked past it at first hoping it was a temporary issue but it has progressed. Now after too much interaction of any kind in the nether im face with an error reading “bat” or “terracotta”. Often ounce i load back in my progress in game is set back roughly an hour. No work around has been able to be found and downloading a backup of the realm to address it further downloads a corrupt save that crashes minecraft when attempted to load. I appreciate anything that can be done to resolve this as this is my first ever world to reach this level of progress and I dont want to lose it.