Interesting.
In windows, on command line, epubsplit throws an encoding error when it tries to include line 2 in the TOC. That's a line of deliberately difficult characters--it is a testing file after all.
It works fine in calibre, and it works fine if you skip that line. I'll look into it.
The split.epub was started, but it wasn't finished. That's why it appears as if it somewhat worked. Running on CLI, you should have seen error message when it failed.
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