When I’m in the reader and I try to get away from a definition of pop-up, it just selects the word to the left of the right just as if I had used the arrows.
Even if I touch blank space it just selects the next word. If I touch the right side of the screen, select the word to the right, if I touch the left side of the screen, it selects the word to the left.
It really reduces usability of the reader, but I’m making it work for now.