Google is moving many websites to the new mobile-first index. There has been another wave of mobile-first index moves during the past few days.
Some webmasters noticed that Google shows a ‘404 not found’ error if you try to view Google’s cached version of the page after the move to the mobile first index. Google’s John Mueller said that the cache needs some time to catch up with the changes. You do not have to worry about this because the cache does not affect crawling, indexing, or ranking:
Sometimes these take a bit of time to catch up – it doesn't affect crawling, indexing, ranking though, so no need to worry ?— John ☆.o(≧▽≦)o.☆ (@JohnMu) 28. Mai 2018
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