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I have no access to stellaris atm, but my thoughts are:
  • Who triggers this event, when and for whom? Because it is is_triggered_only = yes, which means it does nothing on it's own. Either remove that or have somebody trigger it on all countries.
  • Since you are in the country scope already, and either way owner_country does not exists, so just do that: save_event_target_as = owner_country. Or even you can remove all owner_country.
  • Can a faction really be owner of a wormhole station?

Do you know if we're actually able to create our own variables and/or classes?