AI teammate's inventory display will freeze and not display any changes for drag-and-drop or right-click actions if items are being transferred from one inventory gear to another (e.g. from chest rig to backpack).
Moving an item in such a way will trigger the issue every time. The item will be transferred to the destination inventory gear, however the change will not be shown. Any subsequent item move attempts will not be performed.
Issue will persist even if inventory display is closed and then reopened again via Teammate -> 6 -> Inventory command.
Issue will resolve if teammate is ordered to disembark and re-enter the vehicle.