This issue affects picking up stacks of entities. When inventory contains a partial stack of entities, and there is a clump of entities on the ground, which is more than can be entirely picked up by the player, then the player SHOULD pick up as many of them as needed to make the full stack. But INSTEAD, the player picks up no entities, leaving an incomplete stack in their inventory while standing directly on a full clump of entities. Attached image shows this working with multiple types of items, all at the same time -- the ground has clumps of 16 Signs, 64 Gravel, and 64 Prismarine Crystals. Inventory has partial stacks of each, and no items are picked up to fill those partial stacks.