Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the Visual Effects Graph package
3. Create a new Visual Effect Graph (Assets > Create > Visual Effects > Visual Effect Graph)
4. Select "Simple Loop" and press the Create button
5. Double click the created Visual Effect Graph to open it in the Visual Effect Graph window
6. Click on the Render Quad in the Visual Effect Graph window
7. Click repeatedly on the Use Base Color Map's dropdown in the Inspector window
8. Observe the Console window and the Editor

Actual results: Error printed to console: "MissingReferenceException: The object of type 'UnityEditor.ContainerWindow' has been destroyed but you are still trying to access it."

Expected results: No errors are thrown and the Editor is usable

Reproducible with versions: 6000.3.0a5

Not reproducible with versions: 6000.3.0a1

Tested on (OS): Ubuntu 24.04

Notes:

• Does not reproduce on macOS Silicon Sequoia 15.5
• Only repros on Wayland and doesn't repro on 2022.04 with X

Update:

The original bug ticket stated other errors were sometimes printed and the Editor would crash. These issues have now been fixed but the MissingReferenceException remains.