Describe missed deadline and scope expansion

Tell me about one concrete instance where you: (a) missed a due date and (b) went beyond your formal responsibilities. For each case, specify: 1) exact dates, planned vs. actual timeline, and the measurable impact (e.g., customer CSAT, revenue, reviewer acceptance); 2) the decision trade-offs you made (what you de-prioritized and why) and the risks you explicitly accepted; 3) the stakeholders you informed, when you informed them, and the written artifacts you produced (links or excerpts); 4) your recovery plan with milestones and leading indicators (what you monitored weekly); 5) what you would do differently next time—give two process changes that would have prevented the slip/scope creep and one change that would have accelerated positive impact without additional headcount.