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How do you fire the mortar or grenade launcher in JA2? If my merc has a grenade launcher with a shelled attached in their hands, the 3x3 right-click menu has the left item in the middle row disabled. Same for a mortar with a mortar shell attached. It's independent from lying, standing or crouching. Also happens with weapon status at 100%.

Version is Stracciatella 0.12.258 (build 04.12.02).
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It was a bug in the Stracciatella mod which I had downloaded from bitbucket. A newer version with a fix can be found on Github.