when doing the command "/kill @e[type=!minecraft:player]" on an always active repeating command block, any gravity blocks placed above the ground will instantly disappear, when stepped on the gravity block they cause quicksand-like behaviour when re-logging the gravity block will appear and you will be able to walk on it
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Thank you for your report!
We're actually already tracking this issue in MC-56037, so I resolved and linked this ticket as a duplicate.
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