Various textures are pink and black or green and black instead of their regular textures. Sometimes the texture changes to an aqua colour or all black.
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Thank you for your report!
We're actually already tracking this issue at MCPE-41495, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki
Have you tried a full reinstall of the game?
Backup any data you don't want to lose, then try the following:
Backup your MinecraftWorlds folder (if you want to save your worlds) (Device storage > games > com.mojang > minecraftWorlds)
Uninstall Minecraft
Delete the com.mojang folder (Device storage > games > com.mojang)
Reinstall Minecraft
Run Minecraft and if it works restore your MinecraftWorlds folder
Sometimes a clean install of the game will help with these kind of issues.
You might find the following links helpful:
How to Back Up Worlds
How to uninstall and reinstall a game on Windows 10
Quick Links:
📓 Issue Guidelines – 💬 Mojang Support – 📧 Suggestions – 📖 Minecraft Wiki