I had a structure appear in the sky near my main base. It was made of stone blocks, torches, and fence posts. It went away after I logged off. Very odd!
it's only my dispenser facing up into a grass block that causes the crash. Dispensers facing in other directions work fine.
Same problem in Windows 10 Bedrock 1.14.20. I also had several bee hives set up, and all my bees disappeared. I wonder if they got stuck in their hives.