Reproduction steps:
1. Open the attached project "ReproProj"
2. Open the “/Assets/Scenes/SampleScene.unity” Scene
3. In Menu bar, select “Testing > Log Trigger Error“
4. Observe the Console

Expected result: Logging an Error containing "PackageCache" does not trigger any blocking work and does not affect Editor responsiveness
Actual result: An Error containing "PackageCache" is present and “Log tool 222 ms” is printed

Reproducible with: 6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

Testing environment: Windows 10 Enterprise 21H2
Not reproducible on: No other environment tested

Note:
- Reproducible only first time following the steps after opening the project