Would you be able to post a screenshot of what this looks like please?
One of my own personal web projects involved a lot of experimental approaches to navigation designed around the mobile’s Goldilocks zone for thumbs. Illustrated here by Lux Optics as the reachable plains.
From your description, it’s possible the safari changes will interfere with the approach I went with. Will need to test it when I get the previews, but annoying if the new interface obstructs objects now rather than pushing them out of the way.