Deployers that are part of a moving contraption (I tested with pistons and minecarts) seem to get stuck on water sources when they are holding a pickaxe. I'm not sure this is intended, and I found this while trying to build an automated ice farm, so I think it would be useful if they ignored fluid sources rather than trying to break them.

I think Snownee fixed this. Reopen if the issue persists in a more recent version