Tanks directly using certain functions for turrets do not render properly in upgrade menu

[zephiii]

Class.leech = {
    PARENT: "genericTank",
    LABEL: "Leech",
    TURRETS: [
        {
            POSITION: [14, 0, 0, 0, 0, 1],
            TYPE: addAura()
        }
    ]
}

The following code produces this. The tank renders properly ingame but not in its upgrade box.