XCTest: lines covered by unit test reported as not covered

Question

I have unit tests for my XCode project, the test result that shows lines that are covered or not has something incorrect, in the report it's like:

<lineToCover lineNumber="64" covered="false"/>

But I do have unit test covering that line, I tried with a breakpoint while running the test case and it did hit.

Is there something I need to set? It feels to me that the build for testing has those lines skipped somehow.

Thanks!