That is becasue of the clash between server and client. It is there, and the server is trying to get it to work, but, remains a clash!!!
Please note: All vehiclular weapon changes, and / or moddifications that contain visual effect server side will not be "seen" by the connexting clients. Same holds true for the healing effect if added to vehicles.
An example, removing the overheat of the MH-500 server side. The client resuly will be, no visual, or audio at overheat, however, hit indicator is still working as if hitting the vehicle.
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