There's a recurring issue on iOS browser, where the viewport size is fixed, whatever if the URL or action bar is displayed or not.
This result having 100vh usually larger that the actual screen, and not being able to scroll to the end of the page correctly.
Here is a video showing the bug: https://streamable.com/2yguzw
Found this https://css-tricks.com/the-trick-to-viewport-units-on-mobile/ showing a work around, and implemented it in https://github.com/pakokrew/mooni/blob/develop/src/components/ScrollRoot.jsx, which looks like it solves pretty well the issue