Black Bears showing Animal Fat, when they don't actually have any.
I was killing Black Bears and posted 2 bug reports based on them. I now know what is the actual bug, and it is a singular issue, not multiple. Black Bears are in fact showing that they have Animal Fat 100% of the time, even though they don't have a 100% drop rate. If the Animal Fat shouldn't exist, it won't auto stack into your inventory. Placing one of the other loot items in your inventory, will make the Animal Fat vanish, as it shouldn't have existed in the first place. At first i thought it was a full inventory issue, despite my stack of animal fat being only 3/10, now i know that isn't the issue.
P.S: I deleted the other 2 bug report threads i made about the Black Bears Animal Fat issues.
@Xzait I can confirm this issue. Was happening to me last night. It seemed like any fat on a bear that also had 2 bones would just poof(I was only looting the bones).