I was inside a board and used the search form in the header. I searched for "twike" and choosed "entire forum". I found nothing.
I changed to forum index and searched again. I found all topics I was looking for.
It seems the function to search the entire forum out of a board isn't working.
Looks like when searching from inside a board, the board id is kept in the search parameters even though "entire forum" is selected.
Tracked: https://github.com/elkarte/Elkarte/issues/2308