I did just as you explained and got the same result. It seems that changing the view to landscape then zooming and locking, you are essentially locking the view to the top half of each page. I suspect if you were to remove the lock then page down to show the bottom half of a page, then do the zoom and lock procedure again, it would lock the bottom half on all subsequent page turns.
It seems this was the intended purpose of zoom lock....why I have no idea.
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