Some weapon bolts do not stay locked in the rear position after firing a single cartridge without magazines attached ( SA58, pistols, SVD & M21)
For example, when attaching a magazine to the SVD after firing a single cartridge the bolt will magically be put into the rear position for the cocking animation. For the M21 there is also an additional visual issue after firing all cartridges from magazine, bolt stays rear locked as it should but when attaching a magazine, bolts magically goes front position for cocking animation.