I uploaded post #1245083 from ArtNotHearts' Pixiv page containing said image, but while preparing the upload, the Find Artist tool returned nothing. Searching for the artist doesn't return any results either. Any particular reasons for this?
the artist had no artist db entry hence no result. even if someone added the tag in the past but missed adding the artist db entry, the find artist will not work.
and interestingly, these 2 searches below fail. are there other pixiv usernames (in camelcase) exhibiting this behavior?
ghostrigger said: and interestingly, these 2 searches below fail. are there other pixiv usernames (in camelcase) exhibiting this behavior?
Yes, there are. I made a trac ticket for it way back whenever. I believe Albert marked it as fixed for Danbooru 2. Apparently making searches case-insensitive is too advanced for Danbooru 1.