I was messing around in the texture pack settings, then i played a featured server that called "hive" with some friends. And then when i log out from the server the UI suddenly becomes unresponsive. This happened to me before, when minecraft still in 1.15+. I tried to check my phone if it was the problem, and its not. I check the game files and i found nothing. I tried to log out and log back in and still not work. Then i uninstall and reinstall the app. And it works, most of the time. Then i log out and log back in from the app, and the app log me out of my minecraft account by itself. I tried this multiple times and still no progress. The buttons (ui, hotbar, etc) need to be tap at least 3-6 times to work, but the d-pads still work for some reason. Now, i cont play minecraft anymore because of this bug. I need to get a litteral controller to play the game because the UI wont work. Then i write this bug in the forums for the developers to fix this bug again (i hope). I will apreciated if the devs try to fix this, then i can play again. 

-NotNino41