Not every time but once in a while when the bots mine from underneath a belt the ore ends up on the belt, is this intended behavior to make the bots able to mine more per trip or is it a bug? I can see it going both ways, as a mining tool that'd be pretty awesome, as a there's ore under my main bus... well that causes issues XD
I think I've worked out when it happens, if I'm walking past with my robots my robots get assigned and when I walk out of range the items don't get reassigned to the bot network but instead end up as just items on ground and when on belt they are suddenly able to be picked up by the belt. (for now I'm just avoiding mining under belt)