Question: Active logging or suggestions how to investigate a strange functionality

[Tbd19]

I have a Web Api with multiple endpoints that are being tested with Integration tests.
Now we want to generate report for code coverage but for some reason they are 0% coverage.
And I got to this point:
When I filter for a single endpoint the code coverage is NOT 0% and it works as expected
When I filter for 2 or more endpoints the code coverage becomes 0%.
The command is similar just the filtering is different

How can I determine what makes the code coverage be 0% when doing filter for each it is not 0%

PS: None of the tests are failing.