Visual Effect Graph window built-in error message does not appear when making a node connection that would cause the error message to appear

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the Visual Effect Graph package
3. Create a new Simple Loop Visual Effect Graph (Assets > Create > Visual Effects > Visual Effect Graph)
4. Open the newly created Simple Loop Visual Effect Graph
5. Create a new "Random Selector Weighted" node
6. Connect the "Random Selector Weighted" node's output to the Drag Coefficient
7. Observe the Visual Effect Graph

Actual results: No errors appear

Expected results: “An edge with the same input and output already exists” error appears in the Visual Effect Graph window

Reproducible with versions: 6000.4.0a2

Not reproducible with versions: 6000.0.60f1, 6000.2.8f1, 6000.3.0b6, 6000.4.0a1

Tested on (OS): MacOS Silicon Sequoia 15.6.1

Notes:

• Error message appears in all other Editor versions