I found something (dupe)

I was in mineshaft in 1.20 multiplayer and i breake minecart with my pickaxe and it didnt break but instead the items that was inside they dropped but if i hit again minecart it happens again but when i moved minecart and hit it again it got destroyed and when i tried to do it again it didnt work  (in affects version/s i selected 1.20.1 but it happend to me on 1.20 multiplayer server (my server aternos) and i am sorry for my english i am learning it)