FPS decreases to 10-below during world gameplay.

Hello, I'm experiencing a problem here. I encountered a bug that FPS decreases 20-10 and below which causes lag during world gameplay. Hopefully please fix it and improve the framerate for world gameplay. (Affects some of the created worlds in Minecraft)

Update: Affects from versions 1.16.100.51 up to the current 1.16.100 beta version on some Android devices.