Describe the bug
When a villager undergoes death, a second slot in a graveyard can be filled with the same villager. At first I was not sure whats causing it but a running theory I have is that it might have todo to the lack of secondary grave creation if a villager dies from a zombie and turns into a zombified version of it. The first time and the second time being them killed as a zombified villager

To Reproduce
Steps to reproduce the behavior:

1. goto a village and create a small graveyard
2. Set your gamemode to HARD (this dasticaly increases the odds of a villager when killed transmuting into a zombified one)
3. three, spawn a zombie and have it kill a villager in a controlled area
4. notice if a grave if filled once it dies and it becomes a zombified version
5. to recreate the scinerio's have the zombified villager be killed by you, a golem, or a guard
6. observe and see that a second grave in the yard is taken and it being the same.

Screenshots
If applicable, add screenshots to help explain your problem.

Version
19.2 - 7.5.5+

Latest.log
n/A

This is also a bug that repeatedly drops items and can resurrect duplicate villagers.

Steps:

1. First, give the villagers 8 emeralds
2. Letting zombies kill villagers will turn them into zombies and drop 8 emeralds, as well as generate a tombstone
3. Then kill the zombie villagers, they will repeatedly drop 8 emeralds and generate duplicate tombstones again

Screenshots: