Tab-selected list item in region selection page changes from round corners to square corners when activated

When I tab to a list item, the selection box has rounded corners:
<img width="900" height="650" alt="Image" src="https://github.com/user-attachments/assets/b6b7b287-fd47-4b43-afea-6459343e9e31" />

When I hit Enter to activate/select it, the corners turn square:
<img width="900" height="650" alt="Image" src="https://github.com/user-attachments/assets/9395b6d2-300c-4ded-b8c4-d658211910ec" />