I had created a web application in Visual Studio 2017. I upgraded to Visual Studio 2019 and now the .less files dont seem to being rendered.
I then quickly created a standard web application just using the visual studio templates and this displays correctly.
In my original project I then added an aspx page and copied the code from the template project and this doesnt display correctly. I have spent the best part of a day trying to resolve this but with no luck.
I have attached screen shots of both web pages and the DevTools pages.
Non working page
Working page screenshots