How to reproduce:
1. Create a new project
2. Import the Input System package from the Package Manager
3. Import the UI Toolkit package (open the manifest.json file and add “com.unity.ui”: “1.0.0-preview.3”)

Expected result: Input System and UI Toolkit packages are imported to the project and no errors occur
Actual result: 'Assembly with cyclic references detected' errors are thrown

Reproducible with: 1.0.0-preview.3 (2020.1.0b15, 2020.2.0a18)
Could not test with: 2018.4.25f1, 2019.4.4f1 (UI Toolkit package is not compatible)

Notes:
Having Timeline package in the project causes an additional issue