While reading DN21, I noticed that Bu Pj 1:10.6.1 is referenced in a footnote at DN21:1.11.6, but it wasn’t a hyperlink because I was viewing it on “tooltip on asterisk” mode. If you noticed this wanting to look at the referenced passage and tried to look for it by entering the url “suttacentral.net/pli-tv-bu-pj” and didn’t realise why it wasn’t a hyperlink like I did, you wouldn’t find anything because the website has it under “pli-tv-bu-vb-pj”, more in line with its actual position in the Vinaya, instead ofm “pli-tv-bu-pj”.
I’m not sure if this is the case for other references in the Vinaya, but in this case (and others if it applies) I think it might be a good idea to make one of these the standard rather than having a different one for the url (Bu Vb Pj,) and for the recognised abbreviation (Bu Pj). I think the confusion of having to remember to include letters in between the standard abbreviation, and for which references, when inputting a url might be worth making it slightly more confusing by making the reference longer (Bu Pj → Bu Vb PJ). That, or making them redirect to the correct url where they differ.
Judging from this thread, the lack of a hyperlink in the footnote is probably a typo and not an error so I’ll put that in the typo thread (never mind, it’s just because it’s set to tooltip on asterisk rather than sidenote)