Subtitle if "alternative dividing punctuation mark" is only on spine

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The style guide mentions that colons should be used to separate subtitles, except if there is an “alternative dividing punctuation” mark, e.g. an en-dash.

Does this apply only if said “alternative dividing punctation mark” is used on the front cover?
I have a couple of releases where the front cover does not have such a punctuation mark but the spine does (usually an em-dash or an interpunct).

Personally, I’d use what’s on the spine then but what do the experts say?

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The front cover is often beset by artistic flourishes, while the spine is typically more typographically standard. I’d go with the spine, too.