Summary of the problem Milking Fluid Cows with Bucket fails if MFR Rancher blocked Pack Version 2.5.5 What is the bug? Get any fluid cow, wait for it to be ready to milk. Use an MFR Rancher to milk it but don't empty the rancher. Once the rancher is full and the cow is full, it will exhibit very strange behavior if you try to milk it. You get a "bucket of X" which will vanish if you pick it up with your mouse, move it in your inventory, port dimensions, etc. Apparently, the item was not created correctly. Mod & Version Link to log file Is it repeatable? Yes. Known Fix Avoid letting the MFR Rancher ever back up.