Here's a test case you could try...
There should be the following linkable items in the TOC (although the book text is just "Dummy"!)
- Prologue
- Hayden
- - Chapter 1
- - Chapter 2
...
- - Chapter 17
- Coleman
- - Chapter 18/19/20
- Genesis Dawn
- - Chapter 21/22
- Oasis
- - Chapter 23/24
- Afterword
Where the "- " items are level 1 & the "- - " items are level 2
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