By default, ClassicPress generates the string:
meta name=“robots” content=“max-image-preview:large”
ClassicPress SEO generates:
meta name=“robots” content=“max-snippet:-1,max-video-preview:-1,max-image-preview:large”
So we have two strings for robots. I don’t know if it’s harmful to SEO. But this looks strange.
The fix is simple:
remove_filter( ‘wp_robots’, ‘wp_robots_max_image_preview_large’ );
P.S. I rewrote ClassicSEO a bit to better suit my needs. But not sure if this will be helpful for other developers and users.