When riding a Strider and changing perspective from 3rd person back to 1st person, it will make the player face south no matter which direction they were facing before.
What's expected to happen:
Player faces the same direction he/she was facing before changing perspective from 3rd person to 1st person
What happens:
Player faces south no matter which direction he/she was facing before
Steps to reproduce:
Spawn in a Strider
Get a saddle and put the saddle on the strider
Sit on the strider
Change your perspective
Notice that you will face south after you change your perspective back to 1st person
Linked issues
Comments

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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