There are no changes in the APi, I confirm.
Look at the link below, use it with your YOUR_WEB_API_KEY
and try it, you will see the gameextrainfo
required is not present (I tried with your SteamID64 right now)
The API (as part of the private data) should give both GAMEID and GAMEEXTRAINFO, in your case the latter is missing and the logic displays the natural fallback I coded, aka "game unknown".
from the Steam¡s API documentation wrote:
If the user is currently in-game, this value will be returned and set to the gameid of that game.
If the user is currently in-game, this will be the name of the game they are playing. This may be the name of a non-Steam game shortcut.
You are currently IN GAME since your GAMEID is:
time to ask those guys about that maybe?
Also I have found this discussion, dunno if effectively relates since I stopped reading it after a dozen of replies