Atgm

[Imp]

Don't know if this helps but I was playing with the editor trying to make a placed demo charge.
Russian OOB I copied weapon 120 demo charge & while fiddling adjusted warhead size to 30.
Replaced demo charge with this weapon (so slot 4) & found it did not z fire.
If I turned off a previous weapon slot however it did which made me wonder if this is tied to warhead size somehow.

Edit ignore that tried putting in weapon slot 3 also & fires that fine.
If I turn off slot 1 or 2 it also z fires slot 4