there seems to be a small mistake in the cheat-sheet guide for using this extension. I understand YAL is busy with the current real world issues and this isn't a major issue report moreso just a heads up

the documentation for steam_net_packet_send(steam_id, buffer, size, type) seems to be incorrect. it says to use it like this

steam_net_packet_send(steam_id, b, buffer_tell(b), steam_net_packet_type_reliable);

I believe it should be buffer_get_size(b) instead of buffer_tell(b), based on it's description. 
this did cause an issue for me until I fixed it, so hopefully this helps