EDIT: Don't read my comment. The helper is right, not me.
just so you know, MC-249712 is a duplicate. it (and Xfrtrex's comment) clarify that it happens to structures with Allays.
yep. having the same problem 😞
Im pretty sure this is normal. It's happened A LOT to me.
The duplicate MC-249742 has some crash logs, in case that helps for debugging