Something is still wrong with magazines in the inventory and reloading in DEV branch. The issue is present at least since August 30th when I first noticed it, and still in version EXE rev. 127101 and EXE rev. 127127 on September 9th and 10th.
After getting a new weapon from a box or picking up ammunition the magazines you pick up will just vanish. Most times the gun will bug afterwards and pressing R to reload doesn't play an animation and just deletes a mag from your inventory.
Video of it happening: https://www.youtube.com/watch?v=oloQEX_FMj8 {F24778}