So i have this set up and it works fine (though, i want to implement some more fine tuning but that's not related to your question). Make sure when you save your rules to set them to run as well.

First - Like you I have 2 rules with the General at the top.

For the Github General - make sure " Stop Processing more rules" is not checked.

Lastly - The Prs rules should just be to review_requested and on this one you can check stop processing more rules.