Your question is Bug Versus Feature Disagreement. 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 you disagreed with a developer about whether an issue was a bug or intended behavior. How did you work through the disagreement, what evidence did you use, and what was the outcome?