Farmer should notice all harvesters of the challenge I think.
But if you miss on a challenge think of you don’t necessarily get all challenges circulating in the network either. So yeah, you miss out just a little more with this harvester thing. If it’s a systemic bug, I have no idea. You should ask on the official Keybase channel where developers are.
I think the software performs really really well for everyone to date considering how little there is to it. You can see on github, there’s barely much of it e.g. in the harvester files. I could perhaps learn it if I wanted to. However because I don’t and it’s so small my confidence would be limited. Foreseeing lots of possibly unhandled corner case behaviour I’d strive to eliminate the network.
Also see