Why are my code changes being excluded from a local build?

I’ve modified some 3rd party plugin source files and created a new subsystem that inherits from GameInstance that utilizes the modified 3rd party plugin source files. I go to build in Visual Studio, but Visual Studio is excluding all of the files that I’ve modified:

1>[Adaptive unity build] Excluded from AkAudio unity file: AkComponent.cpp, AkGameObject.cpp, AkComponentOcclusionObstructionService.cpp, AkOcclusionObstructionService.cpp
1>[Adaptive unity build] Excluded from <ProjectName> unity file: MusicSubsystem.cpp

What’s going on here? I understand that the build should stop building if it fails to compile or if the linker fails to link the objects together to make the executable right? But it would need to include all changes in order to compile correctly, so why would modified files ever be excluded from a local build? This just started happening today despite no changes in my workflow.

Am I missing something stupid obvious?

EDIT: I added <ProjectName> myself to honor my NDA

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Did you find an answer ?