You guys might know this but I'm just looking out for you guys.
Do NOT use Quiet as a buddy in Mission 29 and 42, your saved data will be corrupted and your hard work will be lost so please do not use her.
Thanks for the heads up Moe :)
Today there was a MGSV update for the PS4. It allegedly fixes those bugs so hopefully we don't have to worry about using Quiet for missions 29 and 42 anymore ^_^