I have about 25 villagers in a trading hall which is not exposed to the elements. Sometimes I find 1-4 of them have disappeared.  10 cows have disappeared from a 4×4 fenced area.  Hopper minecarts have dissapeared multiple  times from localized tracks.  I know this was a problem on  java, i could find a report for bedrock. I am playing with experimental gameplay on.  I haven't had any game crashes yet.