On singleplayer, after a while the tamed wolves' hitboxes disappear when not attended for a while.

Put the summary of the bug you're having here

*What I expected to happen was nothing
Describe what you thought should happen here

*What actually happened was i couldn't access my wolves
Describe what happened here

Steps to Reproduce:
1. Tame a wolf.
2. Leave it unattended and not in your sight for 30 minutes-1 hour.
3. Come back as it becomes a ghost entity.