B42 MP, no mods.
The inventory interface doesn't allow me to pick/store items in my bags or containers up to the maximum capacity/space displayed. The attached screenshot shows one of many instances where this happened, specifically with a medical bag with a maximum capacity of 23, but I can't go beyond 18.4. It also happened before with shelves with a maximum capacity of 36, which wouldn't allow me to discard items above approximately 25.
If necessary, I can record the gameplay with this apparent bug or share the save files.
I don't know if it's actually a bug or just my lack of knowledge about the new inventory management mechanics.