Your question is Respond to Critical Usability Flaw. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You are reviewing user testing results for a product feature that is close to launch. The research shows a significant flaw that could confuse users, reduce task completion, or create a trust issue if released as planned.
What would you do if you discovered a significant flaw in the product based on user testing?