Products now have a limit of 250 tags
To speed up performance, products can no longer have more than 250 tags (whether they're created automatically by an app or created manually in the Shopify admin). Any products that already have more than 250 tags will keep their existing tags, but they can't have more tags added to them unless enough of their existing tags are deleted to bring them under the new limit. This limit currently applies to stores on the Advanced Shopify plan and below.
Learn more about managing product tags from the Shopify Help Center.