GameData: Too many missions installed, not advertising for mission xxx

[realdreams]

Since a recent l4d2 update, I see this information in the console of my linux server every time it starts.

There are about 70 addons on the server and it used to be fine. After that update, the console keeps saying almost 30 of them are not advertised.
GameData: Too many missions installed, not advertising for mission ...
GameData: Too many missions installed, not advertising for mission xxx

Is there still a way to have 50+ addons on a server?

Thanks