When I attempt to turn the sensitivity down in the game, it works when I look horizontally, but vertically is the same as default. I am not sure how to record my IOS device, so I don't know how to prove it other than for you to test it yourself.
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This is a bulk resolve of issues that haven't been updated to 0.16.0+ yet. Please comment below (To open the ticket) and update your affected versions. If you cannot reproduce the bug, please write in the comments so we can resolve it as "Cannot Reproduce". Thank You!
I'm not sure if this is an exact duplicate of MCPE-12570 or not, so I'll mark it as related for now.