XUnit test detected but not running "run all tests"

My Visual Studio detects my Xunit tests, but "run all" (ctrl + R, A) does not run them. However, I can manually select these tests to run them.

Console output:

========== Discover test finished: 2 found (0:00:01,6982309) ========== ------ Run test started ------ ========== Run test finished: 0 run (0:00:01,8070484) ==========

In addition to XUnit, I have installed xunit.runner.console and xunit.runner.visualstudio. I tested to confirm this on a new project. The same thing happens in my actual project. Ctrl + R, A launches all MSTests.

Why is "Xunit" not working "everything"?