Riding a boat with NoGravity on a server without flight enabled causes kick for flying

Setup a server without flying enabled.

Even though you are level4 OP, are in gamemode 1 and the boat has NoGravity, the expected behaviour is that you should be allowed to fly when riding that boat.

The server should check for a NoGravity tag on the boat and ignore that flight rule.

Reproduction command provided by @unknown here