Whenever I afk overnight in my afk spot, I notice in the morning sometimes that some of the hopper minecarts in my autofarms are gone. The entire space is mob proofed with slabs and buttons to prevent spawning, so it isn't a mob doing it. side note, this also happens with named foxes idk why, but theres over a thousand bug reports for that so I have hope. other side note, I'm in a single player world, not sure if that changes anything