Fixture gets lost when running tests with Assembly Attached Action

How to reproduce:
1. Open the attached “IN-134698” project
2. Open the Test Runner window; Window > General > Test Runner
3. Press Run All
4. Observe the Console

Actual result: “no fixture” reported when running “SimpleTest” method
Expected result: Fixtures are present in the logs when “SimpleTest” method is executed

Reproducible with: 1.1.33 (2023.1.0a3), 1.6.0 (6000.0.71f1), 1.7.0 (6000.6.0a1)

Reproducible on: Windows 11, macOS 26.3 (M1 Pro)
Not reproducible on: No other environments tested

Note: Custom NUnit versions used (Test Framework/NUnit): 1.1.33 ↔︎ 1.0.6 | 1.6.0 ↔︎ 2.0.5 | 1.7.0 ↔︎ 2.1.0