I have no evidence for this and I have not read the leaks so take my idea with less than a grain of salt. What I’m thinking is that since all the Dinosaurs who had be living on Sorna were moved to Nublar prior to JW (notes via dinosaur protection group website) the environment is clear and known to be suitable. I know that TLW was also filmed in NorCal and JW3 was filmed in BC which has similarish environments. I’m willing to bet that some how the dinosaurs that got loose will get wrangled up by a Goldbloom gaze or two and be sent back to Sorna to live out their days until the plot deems it necessary.

Before you say “of course they filmed in BC because that’s were Fallen Kingdom ended” I just thought you could get two birds stoned at once by filming there and claiming two separate parts of the world. Also there are three more islands in that chain that could be used (looking at you Pena)