[2162] Tests no longer debuggable through test runner

Unit tests that are launched using the VS Test runner are no longer debuggable.

Even after doing a complete solution clean, and rebuild, launching any unit tests as debug as results in the break points all being listed as "the original source code has been modified"\

Also note this is the ultimate of ultimates in vanilla unit tests, there are no deployment items, instrumentation, post build or any other kind of interventions on my part.


This issue seems to be stranger still, it appears to only use the binaries from a previous test run regardless of anything.


Upgraded to 2167 and this issue seemed to disappear


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