How to recreate it:
If you ride on a horse and change the perspective from 1.st person to 1.st person again, you and the horse will face against the south.
Take a look at the map inthe video below, you see my character facing north however when i change my perspective from 1.st to 1.st person again you see my character facing south.
I have provided a video that shows this.
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Thank you for your report!
We're actually already tracking this issue at MCPE-54715, so I will resolve and link this ticket as a duplicate.
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