Getting kicked from a server while in a boat deletes the boat and sometimes entities in it.
To reproduce
join a server
ride in a boat
leave and rejoin
MC-148950
boat glitch
Resolved
Cannot Reproduce
0
The described behaviour cannot be reproduced on 1.15 Pre-release 2. Boat & mob inside boat will be despawned when player is kicked. When player returns boat & mob respawns.