The sand breaks when it is on a solid block and the solid block is moved by a piston down the sand and the concrete dust breaks this I occupy it to make lay with gravity blocks.
can be replicated by placing a piston then any solid block and then sand or concrete dust then run the piston and the sand breaks
Thank you for your report!
We're actually already tracking this issue at MCPE-81106, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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