https://en.wikisource.org/wiki/The_Return_of_Sherlock_Holmes,_1905_edition/Chapter_1
The page numbering is displayed correctly, until an image/blank page combination in the transclusion intervenes. It correctly displays the page number for the image (Page21) (a custom string) the "blank" (Page 22) (of the Djvu), but fails to pick up the page number for Page 23 (of the Djvu) which immediately follows the blank.
The scripts should be recognising a blank page in the transclusion and amending how it places the numbering accordingly.