The device I'm using is Samsung tab s7 which is a tablet base device. I think this bug effects only on tablets but not phones. Cause when I tried to play minecraft on a phone the right Dpad works properly while on a the tablet it's having a issue on the right Dpad it's not recognising it being touch instead overlapping being recognise it as a attack or destroying a blocks basically the right Dpad is not working. base on the attached video the right Dpad isn't working makes the character to not walk to right. It's going to be a hassle for pvp especially you really need to move a lot there.
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I have the same issue, and im using a phone (Mi A1). It just happend after the update
Thank you for your report!
We're actually already tracking this issue at MCPE-156103, so we will resolve and link this ticket as a duplicate.
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I'm also experiencing this bug. It has to do something whit button size. It (semi) work on button size 70 but not on anything above button size 71.