Recently I had items from my inventory that were disappearing. Notably a plate carrier and the grenades, gun, and holster that were bound to it.
I've had this happen nearly 10 times since these recent patches. UPDATED see comments below appears affect ALL nested containers even those that can legit be nested with contents
The first time I noticed this happened all I knew was that a plate carrier I'd had stored inside my backpack was not there the next time I logged back in.
The second time it happened it also impacted a plate carrier that was in my inventory AS WELL as the crate that the plate carrier was inside inside my backpack (i.e. 2 layers of nesting this time). This second time I lost the plate carrier, all items on it, as well as every single item in the crate (nails, supplies, guns, ammo, etc).
Today I was about to log out with a plate carrier in my inventory. Rather than do so without confirming it was in fact on me I made a point to look at it. Just to make sure it wasn't somehow bugged I dropped it to the ground (from within my bag) and when I tried to pick it up again I couldn't. Somehow an item was inside the plate carriers storage.
That's when I recalled a similar issue I'd run into months ago where items I had would disappear only to end up being found later withing containers inside other storage. For example one time a gun I had thought I'd lost ended up in side a drybag that was INSIDE my backpack.
After asking around on my group's discord I found that bug had recently been fixed in 1.08.153276. In the release notes that bug was titled "Fixed: An issue with stacking items into items using swapping"
Apparently it was NOT fixed for all storage types. And apparently now the side effect is the item AND the nested containers it is in get removed from your inventory (not including the most external item such as the backpack). I am unwilling to try this a third time lest I loose a third plate carrier I also don't know HOW the item got there but I assume it is related to that recent bug noted in the 1.08.153276 patch notes.
I believe that's happening is somewhat related to a recent but that was fixed that allowed items to be stacked into nested containers (for example a dry bag).