If you put a box on an extended piston and then put the box in front of a block and take the box off, it will spawn with the piston out for a brief second and delete whatever block is in front of it, then go back to a closed position. I can't imagine it's useful for anything but you can delete any block from the server, even bedrock. Have not tried it on living entities yet. If I don't return, it deleted me.

Wouldn't work on bedrock regardless as it is hardcoded to be in the blacklist. The best course of action would be adding the extended piston to the blacklist, too.