VA stops displaying the list of methods in a file if these methods are in namespace with exactly the same name as the define macro in a completely different file, and they do not overlap together during compilation.
I tried to understand why this happens for a long time and made a minimal test solution project in which this bug appears.
Here it is:
https://limewire.com/d/I1Xma#elOjxjXswg
WTR:
1. Download VATestMethodsList.zip
2. open `VATestMet.sln` in VS2022
3. Open the `CLI11.hpp` file.
4. Click on the memebers list.
The result will be this:

Sometimes it helps if you do this, but it's horrible
#define CLI CLI
namespace CLI {
...
}