Describe the bug
If one player open the inventory menu and ride on the normal seat of the vehicle, while the other player just left click the vehicle and destroy it.The menu will be remained, so player can take what is inside the menu and cheat because of this.
To Reproduce
Steps to reproduce the behaviour:

1. Player A gets on the seat of a vehicle(not a driver seat) and open the inventory menu
2. Player B try to left click to obtain the vehicle.
3. Vehicle will be obtained by B, and inventory inside of the vehicle can be taken by A

Expected behaviour
This bug will cause a fatal cheat in multiplayer mode ,especially in those flan server.

Screenshots

Versions (please complete the following information)

• Forge: 1.12.2-2855
• Flan's Mod: 5.10.0

Additional context