Yeah the tracked round win only happens once the round is over so is too late.
Ahh the tracker, thanks for the reminder.
If you remove the round win condition from island settings, then use a tracker to track score, its completion event makes an item granter grant the triggering team gold, then use its on item granted event to activate an end game device ending the round.
that way the round ends after the gold is granted, decided by who’s tracker hits the score first.