Upon entering The End and attempting to climb obsidian pillars, it appeared as though I was suffocating in an air block. As I re-entered The End Portal, I went to retrieve my belongings and I was taking substantial damage, as though I was standing directly in the Dragon's breath. At the time that I discovered the bug, the dragon was perched on the Bedrock pillar and doesn't usually attack the player with her breath.
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Thank you for your report!
However, this issue is a Duplicate of MCPE-51214.
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