Map only online shown as "not compatible" and no playerslots unlinke offline

[Norman]

I checked with AI to make the Top Control map playable in the latest release - a TD Micro Last Man Standing Minigame - and so far it works locally against bots (for some reason, the bots don't become active until round 6), but the real problem is that when the map is selected online on a server, the player slots disappear and there's only spectator mode (unlike offline). Server says "not compatible" but passed the test in Resource. Server.log and the others are empty..

Can anyone solve this mystery?

https://resource.openra.net/maps/68925/