It block hatred shorts for 1 minute, and then I realized it turn on Inline playback in YT settings, which I hate even more than shorts cause it removing add to queue and watch later buttons from miniatures in subscriptions section. New feature from YT, yeaaahh:( You must fix your add-on.
I use polish YouTube. I wrote about this option:"https://www.reddit.com/r/youtube/comments/13xugds/watch_later_and_add_to_queue_button_missing_from/"
And you are right your add-on doesn't change it, it's YouTUbe new "feature" which doesn't remember what user set in options. It constantly switch on after 1 or 2 refresh site. But still your add-on not working at all, maybe because recent changes on YouTube which disabled short blocker in another add-on I use.