Indeed, the page-break-before instruction is causing a page break to be created before the start of the chapter and since there's nothing before it, you're seeing a blank page at the beginning. Usually page break before/after are used as section breaks within the same chapter (XHTML file).
I'm not sure whether the standard describes this behaviour but it seems to me that Marvin is correctly honouring the instruction given.
Does your Kobo device honour page break instructions mid-chapter (I don't have a device to test with)?
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