I have been noticing this bug as soon as I booted up fallout 4 v. 1.2,

Ok killing an enemy then going to the corpse the first bug is about 60% to 70% of the time there will be two of some sort of weapon, example weapon name (2)

Ok killing an enemy then going to the corpse the second bug is about 60% of the time, spamming the X button to take everything in the enemy inventory then moving the cross hairs away from the corpse, then back to the corpse, what ever weapon the enemy was using will be back in there inventory.

Best not to mention glitches that can be used to cheat. Bethesda will prioritise fixing these rather than fixing real game breaking bugs like all the ones accociated with preston garvey