Aha Develop needs a way for teams to focus on Bug Fixes (or Defects).
What I would expect to have here is a button called "Features" on the Aha Develop Board view that would work like the "Tags" button . . or Users or Epics - just filter by the Feature type I want to focus on, which in this case is Bug Fixes.
You can filter by Bugs in Aha Roadmaps, but not in Aha Develop!
Engineers are the ones that fix the bugs, and Scrum Masters managing Sprint Boards in Aha Develop is where that work is tracked & prioritized.