• When code locks are removed from the gate by player 1 - player 2 cannot interact with it.
• The code lock still appears on the post for player 2. Meaning it cannot be picked up.
• Not only that but it also displays the code used to unlock, even after it has been put back on the gate by player 1.

This means if Player 1 is shot and killed after unlocking a gate, his partner player 2 cannot lock the gate without first relogging. Meanwhile player 3 (the shooter) is able to walk up to the gate and either take the codelock player 1 dropped and enter the base or player 3 is then able to see the code used to unlock the gate and enter.

Or

Player 1 leaves his base. Locking the gate behind him.
Player 2 approaches 5mins later snooping around. Due to desync he sees the gate display (open press X) however the gate does not open. And for player 2 the code appears on the post displaying the code needed to unlock the gate. Player 2 only needs to relog and input the code displayed on the desynced lock and he has access to the base.