I can't access any hybrids other than indominus rex and the indoraptor in sandbox mode, despite having unlocked them previously and having my main campaign loaded before starting the sandbox. I built the park before adding any dinosaurs, and therefore was not aware of this issue until I finished about 6 hours later. I would like my hybrids, please!
(Note: They are unlocked in the campaign sandbox, but I do not want to rebuild the whole park there.)
(Note: They are unlocked in the campaign sandbox, but I do not want to rebuild the whole park there.)