i think this discussion is not the source of your problem. operative word being think, so take everything with a grain of salt... or not...
you have come up against an issue that is a stubborn one and one that i really do not have an adequate solution; despite having tried.
google is complaining about a redirect.
you can read this blog post here, or more importantly just read the title which says:
Worse Than a 404 Not Found Error? A Redirect to a 404!
then lets look at the network tab in the dev tools for the link that you have provided:
https://www.dropbox.com/s/8c42285ja6...15-18.png?dl=0
(the file manager on this board has me stumped at the moment).
you will see that your initial link issues a 302 and redirects to exactly the same place; and now the http status code is a 404. hmmm.... exactly the title of that blog post.
now, you can comment out this line:
https://github.com/zencart/zencart/b...itize.php#L105
and i'm guessing that going to that link will now issue a 404 without the 302 redirect.
i have gone back and forth on this issue for many moons, and figuring out SEO can be a challenge. but that's what i think your issue is. and why zc has it that way.... you got me... but how you present product 83, if it is a valid product that is no longer in stock and hence its status is off, v. a product that you never had before and does not exist in the database has SEO implications.
but please do not ask me what they are; i am not a SEO expert but any stretch of the imagination.
best.
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