The Bug
When you walk backwards the animation is like going sideways. This was also a bug in java edition and console edition and it got fixed for both of them, however it hasn’t been fixed on bedrock edition.
How to reproduce:
Switch to 3rd person view
Walk backwards
What I expected to happen: The animation is like going forward.
What actually happened: The animation looked like going sideways.
Thank you for your report!
We're actually already tracking this issue at MCPE-49899, 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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