I don’t know if you messed with the anti-aircraft engagement distance values based on the caliber of the anti-aircraft guns, but the Vickers-Terni 40/39 autocannon works and is always the first to fire, but the 13.2mm machine guns don’t. It’s extremely annoying because I have to take the anti-aircraft controls every time I need to fire and defend myself from the planes.
EDIT: I noticed that the 13.2mm machine guns are not even firing at vessels even though I gave them orders to fire at both vessels and aircraft.
Probably cause small guns engage range was decreased in previous major patch, but was bugged for NAB(so 12.7 - 20 mm shot at 8km targets) and now finally fixed it. The fire radius for this machinegun now 1.5 km and it shot at that radius.
They stopped the AI controlled light AA shooting at ships a few years ago - they will only shoot at boats where they have “a reasonable chance of doing some damage” or something like that - so essentially MG’s will only shoot at small boats, if at all,