GetSpellBookItemInfo returning bad spell
 

On the PTR, this function returns a spell that can't be found by GetSpellInfo

So on my warrior GetSpellBookItemInfo return spellID 161608
Then GetSpellInfo returns nil

Did something change or this a bug?

According to wowhead, that spell doesn't exist in either live or ptr. Probably a bug, since it's ptr.

https://www.wowhead.com/spell=161608
https://ptr.wowhead.com/spell=161608

Yeah I checked that. Before making code changes wanted to be sure I wasn't missing something.

More or less random input:
I had issues withGetSpellBookItemInfo on Live, when called with BOOKTYPE_PET instead of BOOKTYPE_SPELL (or nil). I was getting IDs 9 or 10 digits long, sometimes negatives! GetSpellInfo got them right for me though.

On ptr they are changing spell names to async. Register SPELL_NAME_UPDATE to know when the name is available. Here is an example of the change.

That's been reverted for the time being. Maybe next patch they'll bring it back.