Yes, I remember a thread where someone said it's common in some of those OG lines, but I haven't seen it in anything I've grown out to this point. In my experience, with the genetics I've run, it's a reveg issue. I see a lot of threads and questions, so I suppose the qualifier is that UNLESS it's one of those OG lines (a list might be helpful so anyone else who wants to add their here, I think it would be helpful to others) it's likely a reveg scenario.
They continued flowering just fine.
I have seen it, absolutely. Thanks for the reminder!
It has to be! At least I think so. Also, I've been told that there are some OG lines that just grow triple-lobed leaves, period. But I've never grown one out myself, so I can't speak to it. Again, however, assuming it's true (and I'm assuming it's true), I think it's gotta be genetic, just as the reveg expression itself likely has a genetic basis I would think.