Something funny happened:
Changed css in Sigil, added book to Calibre. OK
Replaced cover and flattened toc. OK
Smartened punctuation. NOT ok - formatting went away.
Dragged book again to Calibre and tried all 3 together - again no formatting.
Checked with Sigil - link to 0.css was gone.
Opened the not-in-Calibre copy in Sigil, added cover.
Flattened toc and smartened punctuation (maybe with the same pass) - and now it worked OK.
Book was Null-ABC (Piper) from Gutenberg.
Just a mystery and a warning: do not trust blindly without checking.
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