How to reproduce:
1. Create and open a new project
2. Open Window -> Package Management -> Package Manager
3. Press the "+" on the top left of the Package Manager
4. Press "Install package by technical name"
5. Enter "com.unity.graphtoolkit" and press "Install"
6. Observe the Console

Actual result: Around 80 unclearable errors are displayed in the Console
Expected result: No errors are displayed in the Console

Reproducible in: 6000.4.0a2 (79bd4f638ac0), 6000.4.0b9, 6000.5.0a7
Not reproducible in: 6000.3.9f1, 6000.4.0a1
Could not test in: 6000.0.68f1 (Graph Toolkit package not introduced yet)

Reproduced on: Windows 11 Pro (25H2)
Not reproduced on: No other environment tested

Note: Most of the errors are due to duplicating methods across the built-in Graph Toolkit and the package