First: Awesome mod. Thanks!

I loaded just Arcanus (and fabric) and noticed that none of the bookshelves in a stronghold library have been replaced with the arcanus:fillable_bookshelf blocks.

There were indeed some replaced in a village library, so I'm certain that the mod is loaded. It looks like ~20% of the bookshelves (according to the code). should be replaced with the fillable_bookshelf blocks.

Is that correct or is there some minecraft generation method that prevents the bookshelves from being replaced in strongholds and mansions?

I tried looking at stronghold libraries in both 1.18.2 and 1.19 (didn't try 1.19.2).

Thanks for your time and for the mod!