Steps to reproduce:

Create a new project from the Universal 3D template
Open Package Manager and install Adaptive Performance Apple package (com.unity.adaptiveperformance.apple)
Open File > Build Profiles, select 'visionOS' and switch to it
Go to Window > Analysis > Project Auditor
Install the rules package
Start the Analysis
Make sure to not close the Project Auditor window
Open Unity > Settings (Mac) / Edit > Preferences (Windows) > Analysis > Project Auditor and enable 'Log number of issues after Build'
Open File > Build Profiles and build for 'visionOS'
Observe the Editor after build

Actual results: The build succeeds, then the Editor stops responding and has to be force-quit

Expected results: The build succeeds, Project Auditor logs the number of issues to the Console and the Editor stays responsive

Reproducible with versions: 6000.6.8f1, 6000.7.0b7, 7000.0.0a12

Can’t test with versions: 6000.0.82f1, 6000.3.27f1 (Adaptive Performance Apple package could not be installed)

Tested on (OS): macOS 27.0

Notes:

Also reproducible when building for iOS, but not for macOS standalone
Reproducible with any build step that changes scripting define symbols after the build (for example an IPostprocessBuildWithReport calling PlayerSettings.SetScriptingDefineSymbols). Using such a script it also reproduces on 6000.0.82f1 and 6000.3.27f1
Last Project Auditor frame in the Editor log before the freeze: Unity.ProjectAuditor.Editor.ProjectAuditor:DelayedPostBuildAudit () (at Modules/ProjectAuditorEditor/API/ProjectAuditor.cs:368)
The Editor does not recover (left frozen for over 20 minutes); CPU stays at ~0–2%