Broken piston feedtape with indestructible white blocks

I have a piston feedtape that was running on a realm, and there was a server maintenance while it was still running, and when I joined the realm again, an entire side of the feedtape turned into white, indestructible blocks that I cannot move, and I can interact with other things on the other side of the block. Pistons cannot push or pull them, and hoppers cannot interact with them. (The blocks being pushed were furnaces)