Yeah, I’ve noticed that it varies - I could have it wrong, but it seems from my experience that on the permanent worlds like Gyosha, meteors will spawn if you portal into a region center. But my sovereigns have been different, with both the special event (snowball and Gleambow) meteors and regular ones, they spawn occasionally on the edges but usually have to enter the region center on foot to get them. They won’t spawn if you portal/warp into a region center.
… I should have added that as a disclaimer in my post. I’m putting up the platforms with tokens, BUT you really need to go to one then walk to another - I’m creating them very high up and using gleam on the edges so they can be seen from a long way off, to mark region centers.