Site tags rendering as XML, not HTML

support
3

I saw someone else’s site structure and it’s apparent that my theme is not generating index.html for individual tags. Anyone know if there’s a flag or generic bit of code that needs to be present?

└── tags
    ├── index.html
    ├── index.xml
    ├── thisisatag
    │   ├── index.html <-- not generated
   │   └── index.xml