I tried once more. After unlinking from my computer, the device had two copies of the book on it (according to Windows Explorer) the epub I'd sideloaded manually, and the kepub I'd tried to sideload once more with Calibre.
On starting, the device initially displayed these books both as the topmost in the My Books section, but after a few seconds they both disappeared! How strange.
Actually, the same happens with another public domain epub I've tried sideloading manually. But at least this can still be found with the search function.
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