I have been unable to pick up backpacks and night vision from ground loot. Firstly, the night vision icon is not there, however the text is. When I hold left-click and drag the night vision space at the top right of the inventory is blocked or "red out", however the binocular spot is clear as if it's telling me to place them there. When I try both spots the night vision does not move or equip at all. Right clicking also produces no solution.
However, when the night vision is placed in a backpack and the backpack is in my inventory, then I can equip night vision goggles to the binoculars slot, but the faded out binoculars in the empty slot is gone, yielding the binocular slot completely void of any icon. When I mouse over the slot it will bring up a tool tip signifying that there is night vision in the slot by text. Night vision operates properly by pressing the default "N" key at this point, however there is no night vision physically visible in the game on my head. I have tested this with other players as well and they couldn't see it on my head either.
As for the backpacks, I can not loot them either by dragging to the proper slot or right clicking UNLESS it has been looted off a player's body. That means I can't loot it off the ground or from vehicles properly. However the slot itself shows up properly when selected while dragging.
This has happened on both Wasteland servers and my friend's server, however when I try it on the editor via preview or making my own internet server it works perfectly.