Also affects Win 10 Bedrock version 1.12.1 with server 1.12.1 (Ubuntu)
I ran into this when cloning a shipwreck to be above the water and then tried to use /fill to replace the water with air.
It seems to mainly affect non-cube blocks, although some cube blocks seemed to be waterlogged. Anything affected had to be manually removed, use /fill to replace with air, and then add the block back.
Rob Edgeler
Also affects Win 10 Bedrock version 1.12.1 with server 1.12.1 (Ubuntu)
I ran into this when cloning a shipwreck to be above the water and then tried to use /fill to replace the water with air.
It seems to mainly affect non-cube blocks, although some cube blocks seemed to be waterlogged.
Anything affected had to be manually removed, use /fill to replace with air, and then add the block back.