The typo is not the problem; it's that the typo is evidence of academic dishonesty.
When you make a citation, it means you cracked open the original work, understood what it says and located a relevant passage to reference in your work.
The authors are propagating the same typo because they are not copying the original correct text; they are just copying ready-made citations of that text which they plant into their papers to manufacture the impression that they are surveying other work in their area and taking it into account when doing their work.
They survey one or two works, and then just steal their citations to make it look like they also surveyed 19 other works.
Problem is, the citations in those words are already copies of borrowed citations from some other paper, which copied some of them from another paper and that was the honest one that made a typo in a genuine, organically grown citation.
Just because you propagated a typo that does not mean you didn't see the original. It could just mean that you saw the typo more recently and that's what stuck in your mind as you were busy writing.
> When you read plenty of papers you aren't going to read them again to cite them.
But in fact I do exactly that, exactly because experience has taught me that my memory of what is in a paper is fallible and I should at least cursorily review what I'm citing. In a few cases I've even just deleted something entirely because my premise was based on a recollection of what I intended to cite that was subtly wrong enough to fatally undermine my entire thesis.
I'm not saying you have to read an entire paper over completely every time you cite it but at least pulling it up and reviewing the parts that are informing your argument is definitely a best practice.
When you make a citation, it means you cracked open the original work, understood what it says and located a relevant passage to reference in your work.
The authors are propagating the same typo because they are not copying the original correct text; they are just copying ready-made citations of that text which they plant into their papers to manufacture the impression that they are surveying other work in their area and taking it into account when doing their work.
They survey one or two works, and then just steal their citations to make it look like they also surveyed 19 other works.
Problem is, the citations in those words are already copies of borrowed citations from some other paper, which copied some of them from another paper and that was the honest one that made a typo in a genuine, organically grown citation.