Same for me. It might work again once the "real" dedicated server is released (at least I hope so). Otherwise they might have changed something in the query protocol. I'll wait for the full server release until I put more time into investigating this because I currently don't operate any cs2 server at all.

You could also check your setting for: host_players_show
It needs to be set to 1 or 2 afaik. If set to 0 it doesn't show.