Your question is Owning a Critical QA Escape. 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).
Tell me about a time a serious quality issue escaped your test process into a release or customer environment. Walk me through how you handled the bug triage, worked across functions to contain it, and what you changed afterward to prevent it from happening again.