Pesach - Avoiding Matzah and Seder Foods Before Pesach - אכילת מרור והמינים הנכנסים לחרוסת בערב פסח

From Rulings and insights from the Lubavitcher Rebbe - Rabbi Chaim Wolosow by R Chaim Wolosow.

Beyond not eating matzah on Erev Pesach, the Rebbe notes a Chabad custom to avoid foods used in the Seder—maror and charoses ingredients—until after Korech of the second Seder, enhancing the mitzvah experience. https://www.torahrecordings.com/shulchan_menachem/orach_chayim/231