Additional testing: if you pinch to zoom in portrait mode, then move to landscape and then back to portrait, the objects shift/move to the right in portrait.
The orientation of objects starts to degrade in both views after that. If you continue to go back and forth between views, the zoom effect continues as well. It continuously zooms in on the page content.
The only way to correct the issue is to clear device cache and reload site because simply pinching the page back to the original view doesn’t work.
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After providing a video example of this issue, it has been determined by Adobe that this is indeed a bug.
If you pinch and zoom your site on a iPhone X and then change the orientation to landscape, the view starts to continuously zoom in on the content as you move back and forth between portrait and landscape views.
The only way to stop the continuous zoom is by clearing the cache for Safari.
Again, this is only specific to iPhone X and has been replicated by Adobe.
The following browsers were tested with issue replication:
Adobe has indicated that this could be fixed in a future build. No guarantees.