Reproduction steps:
1. Create a new project (either 2D or 3D)
2. Install the Test Framework package ("Window -> Package Manager")
3. Open the Test Runner ("Window -> General -> Test Runner")
4. In the Test Runner window, open the "EditMode" tab and select "Create a new Test Assembly Folder in the active path."
5. In the Project window, in the top-right, press on the three-dots button and select "One Column Layout"
6. In the same Project window, press the right mouse click on the "Tests" folder and go to "Create -> Testing"
7. Observe the "C# Test Script" selection

Alternative reproduction steps:
1. Open the attached "repro_IN-90519" project
2. Open the "Assets/Test.unity" Scene
5. In the Project window, in the top-right, press on the three-dots button and select "One Column Layout"
6. In the same Project window, press the right mouse click on the "Tests" folder and go to "Create -> Testing"
7. Observe the "C# Test Script" selection

Expected result: "C# Test Script" selection is available to click
Actual result: "C# Test Script" selection is blurred out and not available to click

Reproducible with: 1.4.1 (2022.3.54f1), 1.4.5 (2021.3.47f1, 2022.3.54f1, 6000.0.31f1, 6000.1.0a8)
Not reproducible with: 1.1.33 (2021.3.47f1, 2022.3.54f1), 1.4.0 (2022.3.54f1)

Reproducible on: Windows 10 (22H2)
Not reproducible on: No other environments tested