I know this is being super anal (sorry) but it’s been this way for a while so I thought I would toss it out there.
The add series box doesn’t always detect pasting in a value as a change so it doesn’t start searching. I’m using Chrome so I’m not sure if that makes a difference. Easiest way to reproduce, click on add series paste in “Lucifer” (without quotes) and it won’t search. Now repeat the same process and paste in “The Lucifer” (without quotes) and it will start searching.
I end up having to delete a character (i.e. make a change to the text) in order for it to start searching. It looks as though this issue may only impact single word titles. Again sorry I know it’s a stupid thing but I see this a lot when adding in batches of shows and copying/pasting the titles into the search.
Update: just saw this issue when searching for “Of Kings and Prophets” so my one word title theory is shot.