If you have an empty magazine and you reload, as soon as the magazine is inserted, the reload counts as done when switching to a granade launcher, if you switch to other items like the knife or a pistol this doesn't happen, instead if you pull out your gun you will have to cock back the bolt in order to fire again.
So as soon as I switch to the granade launcher the gun is ready to fire without cocking back the bolt.
Reloading with granade launcher bug
Hey @Zayzek
Thanks for pointing this out! I'll pass this on to the team!