Just wanted to share this result as well; not sure if that’s “fun with physics”, or that pin just “making fun of me” 
With the center of mass right at the bottom, this is what I get: a pin that isn’t sure in what direction it actually wants to fall over … I’m trying to imagine this in real life, if a pin would have an extremely heavy bottom (e.g., a light plastic pin, but then a heavy metal ring right at the bottom), if it would really behave like this? It doesn’t feel realistic to me, though, but I can imagine that that’s because the center of mass isn’t just “close to the bottom”, but it’s actually “on” the bottom/collider (z == 0), which is physically impossible …
