2 conds. per breaker, but 3?

This is not my photo, so I haven’t seen the panel. I’m pretty sure it’s a Square-D panel.
#1 looks like it’s designed for 2 conductors.
#2 Looks like maybe it’s designed for multiple conductors, but maybe not 3? And the design is different from #1 so maybe it’s not designed for more than 1. Obviously the conductors won’t be on different sides of the screw.
#3 Pretty much the same as #2.

Your photos didn’t show, but I have never seen a breaker for more than 2 conductors.