"Just a moment ago, games that are "banned" or whatever because Valve cuts tie with developers are no longer detected by Steam API. A prime example is that (almost) all Digital Homicide games are no longer detected as owned.
This is not a per-app change, but rather a system-wide change, so if you own some games made by other developers that are "banned" then Steam API will also no longer detect them. Not sure if this is intentional and why Valve would do this, but surely this will change a lot of things.
I don't have a complete list of what games are affected, since there are too many. This means if SGTools wants to update their whitelist it can be a non-trivial process.
Also, your profile's game count may have changed, depending on how many such games you have in your account.
For example, I own Barbie and Her Sisters Puppy Rescue (appid: 396390, you won't be able to see that I own this game unless I am on your friends list on Steam and you go to the Friends that Play page of this game), and if you check with Steam API you won't be able to find 396390 as my owned appid."