I have found a bug which is causing the launch of two of my clients site to be put on hold while I resolve.
The word-spacing in the H1 heading is removed when it is linked to the name of the collection item. This is happening on the collection item page and only when viewing on an iOS mobile.
Here are two screenshots using exactly the same text - the first image is static text and renders as expected, the second is the heading linked to the name in the collection and the word-spacing disappears.
This is very frustrating and struggling to find a workaround.