The easiest way to replicate the issue is:
- clone the NGO repository (develop branch)
- Add the com.unity.netcode.gameobjects\testproject to your Unity Hub
- Open test project using 2022.3.13f1 (or higher)
- Open Test Runner and set the build to "Build Selected Tests"
- Navigate down to the Unity.Netcode.Runtime.Tests.dll
- Select a small subset of tests
- i.e. NetworkSpawnManagerTests works
- Hit the "Build Selected Tests" and target whatever folder you like
- Once the testrunner stand alone build has finished building run it
Then navigate to the Test Runner window opened and try to scroll or interact with it.