Vulcans especially did not eat meat from the very beginning in ToS. It was spock who was revulsed by having to eat meat.

But this is Paramount, they only care about the back story if it*'s convenient, and change anything they find inconvenient on a whim. 🤷*

I think it’s SNW: S02E05 Charades.

Spock and Chapel are nearly killed when they encounter a portal created by a higher-dimensional race, the Kerkhovians, who heal Chapel but accidentally reconfigure Spock’s half-human, half-Vulcan physiology to that of a full-blooded human. This happens as Spock is preparing for an engagement ritual with his fiancée T’Pring and her bigoted parents T’Pril and Sevek. Spock’s human mother Amanda Grayson boards the Enterprise to help Spock prepare. Spock does not tell T’Pring of his condition, hoping not to worry her, and relies on the crew to help disguise himself as Vulcan and stall the ritual until a cure is found. Chapel convinces the Kerkhovians to return Spock to normal by confessing to them her feelings for him. Spock is able to complete the ritual, which ends with him making a telepathic connection to his mother that shows him how difficult it is for a human to love a Vulcan. Spock then reveals the ruse to call out T’Pril’s bigotry. Offended that Spock hid his condition from her, T’Pring asks to take a break from their relationship. Spock later admits to Chapel that he also has feelings for her and they kiss. — https://en.wikipedia.org/wiki/Star_Trek:_Strange_New_Worlds_season_2#Episodes