Yes, I noticed this recently as well. Do you know when it started? Is everyone else having this issue? I cannot search by name and get results for any of the NSFW blogs I knew before (my own blog, AOD, @instructor144 , @exotica, @submissive-seeking , etc). All of them don’t show up in a search – mobile (safe mode off) and the web version even.
Even the huge blogs like redtubes are not coming up in the searches, no matter the setting.
If this is intentional, I am somewhat shocked this is Tumblr’s approach moving forward and I am assuming they will take a major hit, which I am sure they are aware of already.
I just hope it is a bug that gets addressed soon.