You can only walk backwards, diagonally to the left, but to the right, you either walk backwards, or walk right. This can be quite annoying when making a large project
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Cannot reproduce, likely a hardware issue (as above).

I tried to reproduce it, and from what I saw, it only happens when you are above the nether's bedrock roof, so I guess you aren't meant to be up there anyway.
This is likely a hardware issue. Cant repo. Infact for me it only does it when im sneaking, and going forward left. ie. Shift+WA. and then I get a quite annoying beep at me. (happens in any program) again I think that is a hardware/OS issue. Not MC specifically at fault.