When looking straight down the motion d-pad is disturbed and you don't move where it should. It shows more when looking down and circling at the same time. In some directions when walking forward you go backwards and when you go to one side you go to the other.
Thank you for your report!
We're already tracking this issue at MCPE-50256, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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