I would say that the 2021–2024 Synod was a "first" in many ways.

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Notes from Wikiquote

It was the first time that the entire Church—and everyone within it—had the opportunity to participate in the synodal process. | It was the first time that non-bishop members participated in the Assembly. | It was the first time that a Final Document was immediately approved by the Holy Father, thus becoming part of his ordinary Magisterium. | From an interview of Andrea Tornielli, Cardinal Grech: A new path to help the Church walk in a synodal style, Vatican News (March 15, 2025)

Attribution

Quote text and notes from Wikiquote: Mario Grech (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.