Rashi DH Aval Nedarim
Same logic would apply to a Korban Neder where Bal Te'acher applies immediately after Yom Tov, so why not allow him to sacrifice it on last day of Yom Tov?
Daniel Gray, Canada
Dear Daniel,
Great to hear from you. Very nice question! One suggestion could be that since once Yom Tov ends there is no more opportunity to bring the Chagigah or Reiyah at all , therefore the concern "Shema Ye'anes" that he might not offer them during the following week, is enough to let the Chagigah and Reiyah assume the status of Zman Kavua which is permissible to offer on Yom Tov. Unlike Nedarim and Nedavos, which ultimately can and must be offered after the Yom Tov, albeit sometimes with an Aveirah of Bal Te'acher.
May you continue to attain greatness in Torah learning and Yiras Shamayim!
Best wishes,
Yishai Rasowsky