I think the powder coater may have had a little trouble underneath the stays.

I don't understand that first picture at all though. The sharp edge has a discontinuity in it in the pic. Can you take another picture from closer to the downtube looking up at it?

It looks competently done and doesn't look like it's cracking. Could have had a little more filler on the bottom. That is one joint where I don't believe in filing, I just move the filler around with the torch until it looks good. Takes a little effort, but with the right amount of filler it just lays in as a nice fillet. Well, to be honest, my motto is "no file." I like the looks of surface tension at work.