Unable to bind RenderTexture to the VisualElement's StyleBackground property

Reproduction steps:
1. Open the attached “IN-112407_Repro.zip” archived project
2. Open the “Assets/Scenes/SampleScene.unity“
3. Enter the Play Mode
4. Observe the Game View

Expected result: The inside of the rectangle is red
Actual result: Skybox is seen inside the white rectangle

Reproducible with: 6000.0.59f1, 6000.1.16f1, 6000.2.7f1, 6000.3.0b4, 6000.4.0a1

Reproducible on: M1 Max macOS 15.6.1 (Tested by CQA)
Not reproducible on: No other environment tested

Note: The StyleBackground structure is missing the implicit operator on StyleBackground for implicit RenderTexture conversion