What Google shows does not represent what Google is counting as a link. What Google isn't showing in it's SERPs, for instance not showing a link in a backlink search, does not mean it's not being counted. In other words, you can't really know except when you see your rankings go up within a week or two.
For more info on Google's algorithm you may want to ask it over in the Google Forum.
Because Google has chosen to not make an SEO's job easy for them. It's been this way for many years. We've discussed this many times in the Link Dev forum. But it's really a Google algo question and you may want to dig around over there as well.