Navigated across a swamp in a boat and then left it sitting in water 1 block deep. Over several minutes, the boat levitated up in the air to about 6 blocks before returning down to water level. It repeated this process over and over for at least an hour.
This happened more than once, but I have not yet tested duplication frequency.
Obviously I expect the boat to stay on the water. 🙂
Additional:
Another player was able to enter the boat while it was levitated, and he returned to the water.
The boat was seen from multiple clients with the same behaviour.
There was no sign of any lag impacts.
Steps to Reproduce:
1. Enter boat
2. Navigate some distance
3. Exit boat in 1-deep still water
This is a dup of MC-505. When trying to duplicate yesterday, I found that the behaviour started after reconnecting to the server.