Minecraft Username: TM_iBeast Brief Description: Moving a Tropical Fish Bucket causes the user to get kicked. This appears to be happening on 1.21.4 and not on 1.21.5 Instructions: Obtain a Tropical Fish Bucket Try to move it in any way. You will get kicked from the server. How many times did you recreate this?: Many. Pyro also experienced this. Expected Result: Be able to move them around. Currently you are still able to place the fish, if you are able to have the fish bucket in your hot bar. You are also able to use the drop key on the bucket in inventory. Evidence:
It seems if you are to place the bugged fish bucket on the floor, dispose of the water and replace it with "different" water, then pick up the fish again, it fixes that specific bucket. EDIT: I can no longer recreate this, however I have a bucket that is moveable in my inventory. I did the above steps to obtain the working bucket but I can't re-produce with any others.