Unit tests which pass in VS Test Explorer fail when ran via build script

[XAML-Knight]

Describe the problem this feature would solve

Unit tests, when ran by the build script, do not pass, whereas they do pass when run with Visual Studio Test Explorer.

Describe the bug

Steps to reproduce the behavior:

1. Run unit tests for PR #4236 via the build script (i.e., not in Visual Studio Test Explorer)
2. Errors are encountered via the build script, that do not appear when running in VS Test Explorer

Expected behavior

Unit tests, which are the same exact code, should behave similarly in different environments

Additional context & Screenshots

Visual Studio version: 16.11.2, Debug/X64

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