[MC-172466] Entities misaligning when growing up

When a sheep/cow/... grows up (age value goes to 0) they are beeing pushed off by their former smaller self to the side.

This can be easily reproduced by using this command:

/data merge entity @e[type=sheep,limit=1,sort=nearest] {Age:-100b}

Linked issues

Can confirm in 20w49a.

Can this still be reproduced in 21w05 or later?

Now the game straight up crashes when the animal grows up... I can't even exit the world any more.

Video is larger than 10MB:

Yeah there was a freezing issue in 20w05a (see MC-213788), but it has been fixed in 20w05b. Could you try again?

Yeah, the bug is fixed now. Thank you!

Which one, the freezing issue, or the entities growing up thing?

Both - the game doesn't seem to freeze any more and the mob's hitbox is now centered correctly.