I put a hopper minecart in a leaf block and the hopper minecart despawned. I made this for my raid farm.

I was making a raid farm when this happened. Since I had the materials, I made a hopper minecart. I put the minecart in a leaf block and I keeper building the farm. Later, when I finished, I tested the farm. It worked except for one part, which was that the minecart despawned. PLEASE fix this. Thank you