The anchor has things that are weird to it. I think you should see the chain underwater. Also if you shouldn’t have to raise it all the way to get moving. Once you raise it a little above the ground your ship should move if you have sails down.
If you are in shallow water you shouldn’t need to drop your anchor all the way down.
If you are in a rush to leave you would be able to shoot the chain to break the anchor and leave but the only way to fix the anchor is to repair it at an outpost or something.
Idk how repairing anchor would work but the devs could find something.
Thanks
