FilletEdge bug? Or mirror bug?

When I run filletedge on these two parts, one of them fillets and the other fails. The blue part was made by mirroring the grey part, so they should both work.

var fillet.3dm (397.0 KB)

Hi Peter - I cannot get either to fail here…

-Pascal

Are you doing 12mm at the front, 6 at both ends of the back?

OK, got it now - I was missing the second 6. My wild-ass guess of the moment is that this has to do with the order the edges are processed, which may be reversed on the mirrored one - filleting is directional… Anyway, thanks, I’ll get this on the pile.
Hm. V7 gets it right…maybe the intersector improvements coming into play…
https://mcneel.myjetbrains.com/youtrack/issue/RH-56110

-Pascal

Thanks!