Milk bucket glitch

I can milk the cows just fine, but I cant move the bucket in the inventory. If I try the bucket empties and just pops back to the last slot as an empty bucket. Also if I log out of the realm and log on again the bucket will be empty.

 

(Also my realm is seriously glitchy after 1.13.0. Not saving properly and has crashed a couple of times which never happened before.)