Cached version a mix between old and new

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Has anyone ever seen Google cache a site and then update the cache
only with a CSS file?

I have a site that was cached a long time ago.

I redesigned the site and put it online a few days ago.

Google has old pages cached, but with the new CSS file
applied to it.  The CSS file is not coming from my browser's cache.  It's
only for some supplemental results.

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