This issue has occured twice since 1.16, and is game-breaking. This garbage bug that never should've been let through into 1.16 causes beloved NAMED pets to despawn when they absolutely shouldn't. I like playing bedrock, but you seriously have to do something about all this garbage, the amount of bugs is ridiculous for what is supposedly the "main version of minecraft" now. Fix this crap now. Thankyou.

P.S. The 1.16 initial version does not show up on the bug tracker, but it also occured in that version.