Anmials are invisable sometimes when leaving and reentering the chunk

Put the summary of the bug you're having here

What I expected to happen was...:
when leaving the chunk and then you reload the chunk the anmails would appear

What actually happened was...:
they didnt

Steps to Reproduce:
1. Go on survival
2. make a small animal farm
3. leave the chunk (so it despawns)
4. Enter the chunk.