I am playing Minecraft bedrock edition on IOS with the caves and cliffs beta. While pillaring up In the nether I died due to fall damage even though I did not fall. When I went back to the area where I died everything in my inventory de-spawned and the pillar I had made was gone. I went back and tried pillaring up again, and the same thing happened.
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We're tracking this issue in MCPE-120140, so this ticket is being resolved and linked as a duplicate.
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