Librera adds a number to epub's title, messing with sorting

[Raestloz]

Happens with Librera 8.8.5 FD For some reason, recently Librera started adding [number] in front of epub title, messing with title sorting. This seems to coincide with the group-position number in metadata For example:

Gimai Seikatsu Volume 1 and Gimai Seikatsu Volume 2 should've been side by side, but since they're rendered as [1] Gimai Seikatsu Volume 1 and [2] Gimai Seikatsu - Volume 2 they're put far apart

Here's the relevant metadata for Gimai Seikatsu - Volume 1 as seen on Sigil:

and here is a worse symptom where said number is rendered twice in Series view

Ignoring metadata helps with the title rendering but also disables features such as display by series

For whatever reason, this does not happen with another device with Librera 8.5.3

Updating that device to Librera 8.8.5 FD caused the same [number] problem

[Raestloz]

I think I got it

On Librera PRO 8.6.27 the [number] is rendered at the end of the title, rather than at the beginning so there's no issue with sorting by title. That is the latest version in my possession that does not have this issue. Version 8.6.47 started putting the [number] at the beginning, thus messing with sorting