I just tested this with some funny font, and see the same result as you. Apart from renaming a font, I see two other easy workarounds.
1) Don't power off. I think a lot of users almost never power off.
2) Use kepub.epub instead of epub. Once you assign your font to a kepub.epub, the font is loaded as soon as you open this book (and available to the dictionary). This should be sufficient for in-book-dictionary-look-ups.
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