Sirach prologue (Chapter 0) missing from navigation

The text for Sirach 0 is present in the modules that include it (e.g. NRSVS, NETS, LXX Rahlfs Tagged), but the navigation dialog starts at chapter 1. If I enter Sirach in the Verse Search bar, it takes me to the beginning of the book (Title, then Sir. 0). Since the 0th verse of psalms is included in the navigation dialog, I believe the 0th chapter of Sir ought to be as well, and is therefore a bug. 

This is an issue in both the MacOS (14.1.2), iPadOS (3.5.1), and iOS (3.5.1) versions. All devices are running OS 26.4.1.