For those having issues setting up a maplist and map rotation with workshop maps. Try the following, which will use the maps in your subscribed collection id.
If you host workshop collection, mapgroup cvar get automatically replaced with collection id, so you not need set maps in gamemodes_server.txt
1) Set the gamemodes_server.txt to empty as follows:
"GameModes_Server.txt"
{
}
2) clear or delete ...csgo/subscribed_file_ids.txt and subscribed_collection_ids.txt
3) Disable/Delete SM plugin Nextmap: /csgo/addons/sourcemod/plugins/nextmap.smx
4) restart server
5) Test and see if it worked using server command: print_mapgroup_sv
To see your map list
