I cannot see more debug info even after I turned the "Reduced Debug Info" off and pressed f3. I tried to do /reload, but it didn't change. Please check if this is a bug or I have to restart the game. 

P.S. It used to work when 1.20.1 first came out, and after 2 weeks/more of inactivity I logged in again and this happened. I usually use Sodium with replay mod, but it happened so I changed back to vanilla and still the same.

Edit: It only works if you use "/gamerule reducedDebugInfo true/false".