I should specify its on the dev version for 1.6, but i had this issue before on 1.5 aswell

Me paso, lo que yo hice es equiparlo un escudo y luego desequiparselo y volvió a disparar.

For me worked just to restart the game =/
But I believe, you tried it...

I have noticed this myself. I've come to realize that pawns that pick up the shield belt, even if it's a utility slot item, will not fire their weapon. And I firmly believe that trees will block line of fire as well. These are the two main reasons why my pawns won't fire that I have found.

Problem can also be caused by using RunNGun + Simple Sidearms, specifically when using a weapon that CAN be fired moving and a weapon that can't. Restarting fixes every time.

2 handed weapons like shotguns cant be used with stuff like balistic shield or any handheld shield. pawns love equipping handheld shields if they dont already have a weapon equipped so check your clothing policies if u want to prevent that or just inventory manage better in general, also yes dont have a shieldbelt equipped but thats usually more obvious.

I am having this issue whenever ammo is enabled. Playing with Medieval Overhaul, they are carrying crossbow and crossbow bolts, but whenever they see a target, they put the crossbow in their inventory and just stands there. They won't reload.