The player appears to get pushed back and forth from inside the tree due to the physics engine... I can't explain how awkward this is. ...Just refer to the attachments below. But be warned... Prepare for seizures... If you have any.
(Side note: You really should update the device compatibility list in here, because I have an iPhone 6S, and I play Minecraft PE on it.)
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Thank you for your report. This issue was, however, submitted earlier as MCPE-15266.