Have a nice day, devs!
This bug appeared after DLC Tanks (1.82). Now, the subordinate AI will not execute the order of any his commander (player or other ai-commander)
Namely, if the ai-subordinate squad under AI-command, then they cannot execute "LOAD" waypoint. In other cases, AI can not execute the player's order - "GET IN" of player vehicle.
Note that at the repro, the problem will arise only after the player vehicle movement , even if it is already idle. If you order ai-subordinates without prior movement then they will enter the cargo hold without problems
6 June 2018
I found a feature of this bug. The AI-subordinate will enter the cargo hold only if player vehicle are in the formation status. If the AI does not go inside your vehicle, order your vehicle-driver the command 1/1 (Return to formation) - only after this the subordinates will enter the cargo hold.
Devs please fix this error, AI-subordinates must enter the cargo compartment regardless of the vehicle formation status