When my inventory is full and I break rocks, chop trees, or get other drops, the items stay on the map. It’s normal that they remain during the same day, but the next day they should either disappear or be collectible if I have free inventory.
Currently, they stay forever — sometimes floating next to objects (like trash bins) or even in the ocean — and can’t be picked up with tools. After a while, the map gets cluttered with stuck items.