Comment thread is not removed when all it's comments are deleted

I commented and replied two times, all with the same user. Then deleted the 3rd, 2nd, 1st comment and ended up with this:

<img width="1413" height="633" alt="Image" src="https://github.com/user-attachments/assets/9af94806-1b99-431c-86ae-f9effcce0fe7" />

<img width="1458" height="330" alt="Image" src="https://github.com/user-attachments/assets/62844e09-4cf7-4a06-abbc-1ee39d15093a" />