Version: 1.2.0.124
Modded: No
This has been happening to me and my friends since the game released in early access 2 years ago, unfortunately it doesn't seem like it has been fixed since returning to the game
Sometimes your bullets will not damage AI, I recently experienced this after returning to the game when pulling up to a supply depot with FIA AI and not being able to kill them. I wasn't able to kill them when switching to other guns either, I was just spraying into them doing no damage. My friend who was in the car with me was able to damage AI so it was only affecting me. It was only until I re spawned that I was able to shoot and kill AI again
It's happened to me before and I'm sure if I keep playing it will continue to happen so I'll be sure to record the next time it happens and reply with it here