When mentioning a problem or solution for a font naming issue, please also mention if you have tested in the EPUB or KEPUB readers. There are some fonts that work fine in the EPUB reader but have problems in the KEPUB reader, perhaps vice versa too, and only the KEPUB reader will automatically create italic/bold versions of fonts if those styles are missing.
I haven't tried Bookerly, but the problems sound similar to what happens to Gentium Basic in the KEPUB reader.
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