As you can see in the image, every falling blocks can break without any reason. I think it occurs because a block pass through another one. So when one of them is no longer an entity, but becomes a solid block, the other can't be placed (we can see it at the level of the piston).
I'm using a tower of concrete powder, paired with a piston activated each 4 ticks to illustrate that bug.
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Thank you for your report!
We're actually already tracking this issue at MCPE-40404, so I will resolve and link this ticket as a duplicate.
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duplicates MCPE-40404