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Would love to hear any thoughts.

Over the past 5 months many of our clients are having indexing issues for their blog posts.
A blog from 5 months ago could be indexed, and a blog from 1 month ago could be indexed but blogs from 4, 3 and 2 months ago aren't indexed.

It isn't consistent and there is not commonality across all of these clients that would point to why this is happening.

We've checked sitemap, robots, canonical issues, internal linking, combed through Search Console, run Moz reports, run SEM Rush reports (sorry Moz), but can't find anything.

We are now manually submitting URLs to be indexed to try and ensure they get into the index.

Search console reports for many of the URLs will show that the blog has been fetched and crawled, but not indexed (with no errors).

In some cases we find that the blog paginated pages (i.e. blog/page/2 , blog/page/3 , etc.) are getting indexed but not the blogs themselves.

There aren't any nofollow tags on the links going to the blogs either.

Any ideas?

*I've added a screenshot of one of the URL inspection reports from Search Console