I’ve been stuck on this mission for a few months, and as you can see I definitely have got enough buildings on isle sorna.
Support has been largely unhelpful, saying they cannot fix it, cannot manually complete it (which I find hard to believe), and have passed it on, so I will hopefully see it in future updates.
A few updates have come and there was nothing relating to this bug.
Bringing it here to see if anyone else has encountered it, and bring it to the attention of the mods here. @Ned
It has definitely dampened my wanting to play as one of my goals was to complete the missions.
Combine that with another goal being to unlock all the dinos which doesn’t seem like Ludia will do, and the fact that I’m was in the one time zone where for half the year the hatchery discount and all the DNA discounts are between midnight and 6am it has not made me want to invest more time or money playing.