Remove numbering of chapters also disable gitbook searching list in sidebar

When searching in gitbook-style book on web, relevant chapters would be listed in sidebar. But if I remove this auto-numbering of chapters, by using

# Test-Chapter {-}

This "Test-Chapter" will never be shown in sidebar after searching, even if it was a relevant chapter.
How can I turn-off numbering of chapters, but still keep them in sideber (if relevant) when searching by using bookdown gitbook-style?

Demo website: https://bio.odb.ntu.edu.tw/test/ Type 'urosome' in searching box. Only numbering chapters shown in sidebar, but un-numbering chapter ("test-words" here) disappears.
Reproducible Rmd, css and configure (YAML) files: https://github.com/cywhale/ODB/tree/master/bookdown_test

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