2026-July-08 - 2026-07.16.15675
Fix IllegalStateException in TechnologyFrontier#removeAdvance (#14684) Make removeAdvance idempotent instead of throwing when the advance is already absent. This can legitimately happen when multiple map triggers attempt to remove the same tech in the same event, as seen in the invasion_usa map (issue #14635). Co-authored-by: frigoref <frigoref@web.de>