Whenever my game autosaves, it crashes, AND its cauing my villagers ans animals (who are in enclosed spaces) to despawn

I'm playing my survival world on Minecraft Bedrock (On the Nintendo Switch) and whenever my game autosaves, it crashes. The worst thing is that when I get back, mobs like villagers and sheep and horses (who are in gates and houses where they shouldn't despawn) despawn anyways, and its SUUUUUPER annoying. PLEASE FIX, I BEG OF YOU