Each time the game is run, the mouse sensitivity for looking around is set to default, and is very low. This happens regardless of adjusting the slider in settings. Adjusting the slider an increment immediately resolves this issue.
Note, the slider does save the value I left it at, but it does not set the sensitivity unless it is adjusted in that instance of running the game.
Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-22135.
It has been linked to this report. If you have additional information, please add it to that report.
If you have not, please search before reporting, as it's likely that one exists already.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Feedback – 📖 Game Wiki