I am not so familiar with the history here, but I believe the bug reporter badge is intended to be awarded when a bug report has been confirmed as a bug by the team. Doesn’t matter whether it’s been fixed yet or not.
It is true that the query only recognizes likes, not reactions. So when @lilly added 
to one of your topics it did not grant the badge. Arguably, that’s as intended. If she had confirmed the bug then she could have come back to add the 
like. But if she had used 
or some other more enthusiastic endorsement of your bug report then that’s not entirely fair.
Could also be that the person who handled the bug report didn’t think it was badge worthy? If this happens to you again feel free to DM me and I will take a look.