When firing missiles from a distance using a laser designator while the launchers are far enough away to not render but still be loaded the missiles will still be rendered within the launchers when you go back to them and the control panel will still report that it is ready to fire.
Unloading the area the launchers are in will correct this.

ICBM Version: ICBM-classic-1.12.2-4.0.0b20200101191300.jar