It’s a “cube” collider when using boxcollider2D. The “cube” item will gradually slide off as the player hops on it, but I’m not sure how to solve that. Or is there a simpler method to prevent an item from colliding with a cube?
I considered creating a top collision game object and angling it with a box cast.
If the cube is never going to move, then remove the RigidBody2D from the object. If it needs a rigid body for other reasons, you can set the type to Static or you can use the Constraints to freeze the X and/or Y position.
Sans112’s answer of increasing the cube’s mass in the RigidBody2D can also be a quick solution.