Some bugs

[Imp]

Soviet tankette unit 302/339 T-27 cannot fire at infantry in the same hex it is in. Also when you fire at infantry in the same hex with unit 593 OT-27 and use W select and choose 4 for the MG the tank fires the Flame (slot 1) instead of the MG.

As I use these I can tell you why they behave that way & that its correct.
Weapon 4 is a BMG so it cannot be used against a unit in the same hex as its assumed the unit has managed to avoid its covered arc.
Using W to fire weapon 4 causes weapon 1 to fire if the BMG cannot fire at the target due to facing.

German weapon 88 PzB 39 ATR

Use this often to works exactly as you would expect, max effective range 300m best used at half that. You need a lucky shot to cause any damage above that range.