[2020] Gun Won't Fire or Reload After Swap?

So, I keep having the same issue which constantly gets me killed. I swap from one gun to another, and for whatever reason it will not let me shoot.

I have to swap back, fire that gun, then swap back again and fire.

If I don't, I can't shoot - I can't reload. Nothing.

Does anyone else have this issue?

EDIT: ON PS4