Whether it's beta or regular Minecraft the LT and RT buttons haven't worked properly since 1.19 I believe. I've tried Xbox controller, Razor Kishi, Playstation controllers they all have a bug where the triggers click multiple times instead of once.

This cause issues in menu, placing multiple blocks instead of one, sometimes I can't eat or open doors. I see multiple people been talking about this bug and it's very important to bedrock editions because most people don't like touch and only use controllers. Hopefully you guys jump on this right away because it's almost unplayable and has been for about a year now with no fix. 

Your mobile community is probably your biggest community besides Java with phones and tablets and the fact we can't use controllers is hurting half of your player base experience with the game.