What determines whether an owned resource is hyperlinked when cited?

I encounter fairly regularly this sort of situation: some books are cross-referenced with hyperlinks that lead to the owned resource. Others are not.
What accounts for this? Tagging at the time of the Logos publication (ie., if a book wasn't available then, it was not tagged)? Bibliography vs. specific reference? A need to reindex when acquiring new resources?
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"Tagging at the time of the Logos publication"
Although I think occasionally more tags are added to major resources later. I sometimes report this as a typo and mention the resource in the comments. I don't know if it does any good.
Using Logos as a pastor, seminary professor, and Tyndale author
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Often I am missing links, e.g. for the Works of Vieweger. As stated in my review, in this there is a nearly 100 pages of bibliography without links to other Logos resources.
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very often, resources mentioned/referenced only by title - as in your screenshot - are not linked, whereas those referenced with a page numer or other precise location were made into links (at the time when the resource was poduced / updated).
Have joy in the Lord!
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