The cover image itself is not typically part of the spine. The cover.xhtml file that includes the cover should be in the spine. And typically the cover.xhtml is not set to linear="no" in the spine as that means some readers will skip it.
So try changing the first spine entry to point at the cover.xhtml and remove the linear="no" from it.
You did not provide the full manifest so I do not know the id used by cover.xhtml entry to tell you what to replace the "cover" idref in the spine with.
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