Update – February 3rd, 2020: This bug has been fixed. You can safely use this directive without side-effects.
We found that when using the robots directive
max-image-preview:none in combination with
nofollow, Google Search will render the robots meta contents as such:
<meta name="robots" content="none" />
none is equivalent to
noindex,nofollow, and that means your page will be removed from Google Search, which is not our intention. The cause of this issue is probably due to a regex bug in Google’s parser. We informed Google via Twitter, but it went unnoticed.
So, from The SEO Framework v4.0.3, when you apply
nofollow to any page, the
max-image-preview:none directive will be purged from it. This change will prevent your pages getting taken off from Google Search unintentionally.