Building UE4 solution fails in Test configuration

Attempting to build the full UE4 solution for the Test configuration fails in 4.21. Most projects will build successfully, but a few will fail with various errors. Most of the errors appear to be related to stats and logs.

REGRESSION:
Yes. Building the UE4 solution for the Test configuration completed successfully in 4.20

1. Open the UE4.sln file in Visual Studio.
2. Set the Solution Configuration and Solution Platform to Test and Win64 respectively.
3. Build the solution.

RESULT:
Most of the solution will build successfully, but a few projects such as UnrealHeaderTool and ProfilerClient will fail with various error messages.

EXPECTED:
The build completes successfully for the solution.