How to reproduce:
1. Create a new Unity project and install the VFX package
2. In the Project window, right-click -> Create -> Visual Effects -> Visual Effect Graph -> Any VFX Graph
3. In the Blackboard, click "+" button -> Property -> Cubemap
4. Expand the "Cubemap" value -> "Value" field object selector
5. Observe the opened selector
Expected results: The selector loads the available Assets correctly
Actual results: The selector briefly shows all Assets
Reproducible with: 6000.0.69f1, 6000.3.10f1, 6000.4.0b11, 6000.5.0a8
Reproducible on: Ubuntu 24, macOS Tahoe 26
Not reproducible on: No other environment tested
Note: Reproducible only when using the "Classic" selector