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W
Apon further investigation 'unitPlacementOnlyAllowedIn' cannot be used with triggers because the option is just the inverse of 'unitPlacementRestrictions' which can be changed with triggers.
Cheers...
@Darmok72 here is a new starter request, it was half done but not completed, it will affect about 1/4 maps, so please attempt this.
https://forums.triplea-game.org/topic/2999/2-6-release-getting-close-need-volunteers-to-help-beta-test-2-6/73?_=1762176127175
EDIT: Also copied links from above link https://forums.triplea-game.org/topic/2752/maxbuiltperplayer-error-resets-purchase-ui-was-how-to-limit-the-number-of-units-purchased/11
https://github.com/triplea-game/triplea/issues/9231