Problems with in-app (markup) links in footer

In an app, we use footers with links to other books in the app. (the app is not a Scripture app but an English learning resource called “Expand Your English”.)

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The links are in markup format

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The problem is that they only work on the first page of every book. Nothing happens when they are tapped on all other pages (chapters). Tested with SAB 9.0.1 on Android. This must be a bug, can it be fixed? Thanks.