Graph can't be opened but still can be edited and saved when the conflicting Script with the same class is used in the project

How to reproduce:
1. Create a new Unity project and import the "MySimpleGraph" Script and "New Graph 1" Graph
2. Open the "New Graph 1"
3. Without closing the Graph, import the "Graph" Script
4. Try opening the "New Graph 1" Asset

Expected results: The Graph can still be opened
Actual results: The Graph can't be opened but still can be edited and saved in the opened Graph view window

Reproducible with: 6000.4.0b7, 6000.5.0a6

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested