bernard
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@bernard, those pretty links can result in blank pages being indexed, which is what happened to me. Definitely nofollow them to control crawling (though Google has said they're now going to crawl them to decide how to use them, but should learn they're affiliate links and stop crawling them). One thing you do NOT want to do is block crawling of those in the robots.txt or they'll index the blank redirects as pages.
Everything else that's noindexed, blocked by robots.txt, 404, etc... you'll want to update the links pointing to them to be nofollow in hopes to stop them from crawling those links. You're probably not seeing crawl budget issues but I think being efficient for Google's sake is a great idea, something they'll reward more and more in the future as crawling and indexing costs keep skyrocketing exponentially. They may already as some small ranking factor.
The strange thing is that Google keeps indexing some custom posts, that is from feeds, which have been noindex, nofollow for months if not years. Just won't let them go.
Anyway, now it seems all custom posts redirect to the front page, after turning of "public queryable", which I suppose should fix most of this.