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Description
The lifetime of testhost process isn't directly controlled by the IDE. It basically depends on the lifetime of a discovery/execution operation and exits as vstest.console dictates at the end of these operations. What is happening here is that because there was an unhandled exception as part of the execution workflow in the translation layer, it tries to perform cleanup which terminates connection with vstest.console which doesn't ensure test host being cleaned up.
Related issue
Associated bug: here