When I enter the End, the ender dragon freezes in place and flaps his wings. His health bar disappears and the exit portal opens. I respawned him using the end crystals and the same thing happens. All this on survival. I went on creative on several other worlds and had the same outcome. I couldn't find a similar bug submittion on this update.
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Thank you for your report!
However, this issue has been closed as a Duplicate of MCPE-31765.
This is likely to be the same root issue. Your additional information and observations are very useful, so if you can add them to the comments section of the parent issue it would be appreciated.
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