If you enter a portal as you open a GUI block (such as a chest or an enderchest), it kicks you out sometimes and will usually keep the open animation and make it so that you are unable to open GUIs (other than your pause menu). Restarting Minecraft does resolve the issue.
Depicted near the end of this video: https://youtu.be/x3_BrNcH4SQ
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We're tracking this issue in MCPE-53530, so this ticket is being resolved and linked as a duplicate.
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