The "pushing" functionality was removed recently, but the animation remains. This also blocks item usage.
Note that the hand animation should still display when the cart is on a rail, as this allegedly reverses its direction.
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Should probably test that. Probably compounded by the fact that furnace minecarts always face south east or whatever.
This is still in 1.16.3 (New report was made MC-200544 due to conversation held over on the mojira discord)
This is working as intended.
When you push the cart with your bare hand or something like a wooden stick while the cart is powered, though the item isn't consumed, you can observe a change in the cart's moving direction. The animation is for changing of direction, not just for the consumption of fuel.