I don't know if it's a bug, or it's supposed to be like that (but I don't think so). Just look :
There's just 160 cactuses randomly lying on the ground (I took a picture when I picked only 140). Just why? It doesn't seem like it's supposed to be like that you know.
A long time ago, it happened to me only once but then it was not cactuses but monster meat (then it was in pig village - so it's proof that it's happening randomly)
I think that should be repaired becuase it's a big help when e.g. someone is starving.
*There's no steps - it's automatically happening*