Steps to reproduce:
1.
/summon MinecartCommandBlock ~ ~ ~ {CustomName:"Test"}2. Punch it.
3. Note that it will drop a renamed minecart, not a command block minecart.
MC-33312
Breaking a renamed command block minecart drops a minecart in creative mode
Resolved
Duplicate
2
Can confirm. Also happens randomly within custom name (at least for me).