I have got a question on Stack Overflow in Russian created Dec 12, 2018, 19:58 MSK — and it still has no answers for 15 days.
Is it a bug?
The question has a score of 0, and it looks like the question fails to meet the
Implicit quality requirements
To prevent people from posting nonsense just to earn a hat, most hats that require creating content, especially questions and answers, have some requirements that may not be mentioned in the hat description. Generally this involves questions/answers having a positive score (i.e. getting at least one upvote)