Sometimes after leaving the game open and then entering it again, a texture bug occurs.

Thank you for your report!
However, this issue is a Duplicate of MCPE-31377.

If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki