Game mode: Online
I found that using the Take All function (when opening a chest for example) causes the top left item in your inventory to be highlighted. When you next press the space bar (to take all again), the top left item in your inventory is dropped - because the space bar also serves as a drop key.
I lost two bearer packs in this way. I could not work out how I had lost them - but worked it out when I went to check my fish traps. Using take all a few times in a row to check the traps, I saw I was dropping items as I went.
I’m guessing there is no need to highlight the top left item in the inventory when you Take All?
Steps on how to reproduce issue: