I'm not sure this is a bug, but also, I can't see how it could possibly be deliberate:
My MC was a Revaire widow who uncovered many secrets, including unlocking the rebels secret chain. She did not have high enough friendship/respect to unlock Sayra's confession in week 6, though. Come week 7, on the night after the Arland/Jiyel negotiations, Gisette's event triggered like normal. However, she only had one choice available, and that was the choice to collaborate with the new royals against the rebellion.
This is a highly ethical widow, and there was never any chance of her betraying Clarmont and the others.