It's possible to soft lock and grief the survivor team with this exploit. See video.
#Abusing the survivor inventory drop system to trigger a gamebreaking exploit
errant fiber
Fixed for the 16/06 update
torpid heath
Still able to pull it off
errant fiber
Added a delay to stop this madness
torpid heath
I'm starting to feel bad about this one... 😦
I open up the chat and type in "latest update" to show the fact that I am on the latest update because #1384917598281662567 is fixed
torpid heath
Abusing the survivor inventory drop system to trigger a gamebreaking exploit
errant fiber
I can't reproduce, but it looks like you can. I'm adding a new fix.
torpid heath
I'll give a tutorial later. I'll see if I can somehow have my input show at the top right of the screen or something too
errant fiber
I'll give a tutorial later. I'll see if I can somehow have my input show at the ...
I even played the video frame by frame to understand what was happening. Looks like you was picking an item that was just dropped.
But I was not able to reproduce. 
torpid heath
It's a little harder to do but still possible.
Figuring out exactly the kind of input you need to replicate this on your end
Yeah I can't do it without spamming. I think I'm picking it up and dropping it on the same frame or something
It may be worth looking at the other items. I'm only able to do this exploit with notes, keys, gemstones, and statues.
I can't pull this off with batteries and pills
errant fiber
Tried a new fix for this, need some general tests for items. 
I tested picking up, dropping, picking up back, and picking up drolls with Mary.
torpid heath
(Fixed) Abusing the survivor inventory drop system to trigger a gamebreaking exploit
It looks like the key itself has its own "temporary lock" feature similar to Mary's dolls. This definitely works and real players would never notice it in a real match. I am trying to do this bug and I just can't 🙂