I have a Nintendo Switch Pro Controller.
I linked this Controller with my android mobile Phone.
Minecraft doesn't support the ZR and ZL buttons.
My Controller isn't broken because I had download a gamepad tester and the buttons ZL and ZR worked so it is a error.
I hope you will repair this Bug soon.
Thank you
Thank you for your report!
We're tracking this issue in MCPE-90804, so this ticket is being resolved and linked as a duplicate.
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