I was in the middle of an ocean when I tried to open my inventory to get some food when it wouldn't open. I tired hitting the two buttons that open my inventory on the controller multiple times to no avail. Then I tried it on my connected keyboard, and lo and behold it does open with a keyboard and mouse, but not my controller.
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We're tracking this issue in MCPE-171368, so this ticket is being resolved and linked as a duplicate.
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