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<marker playerid="#1" visibility="WhenInFrustum" manialinkframeid="Frame"/>
BUT
As soon the mode is played on dedicated server, this visibility is ignored and overridden by "None" or "Always".
UPDATE:
I realised that they didn't work simply because I sent gamemode version, which didn't use WhenInFrustum visibility setting for markers. (facepalm) I haven't tried the newest one, so It's still to be confirmed.