Something I noticed, not exactly a bug but maybe?
When I move stackable items into (or out of) a container and there is already a pile, they do not combine automatically. Like putting meat into a bag that already has meat, I'll have two stacks. But moving one stack ONTO the other stack, they do combine. AND if I have the source stack in the current inventory(like I'm inside the bag the meat is in) and pick up off the ground, it does combine. It's a non-issue, because going into the container and stacking things is super simple, but wanted to let you know.