Animals and villagers etc. with name tags disappear when the game crashes or when you leave the immediate area for too long.. (villagers seem to be loading, but not moving/ sharing food, which normally makes them disappear.)
MCPE-42496
Name tag problem
Resolved
Invalid
1
Thank you for your report!
Crashes such as these are logged automatically, and will be looked into further by the development team.
If you need help or support you might like to follow a link below.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki