“d3d12: trying to draw without an active vertex or fragment program.” error is thrown after assigning Materials to certain Elements in UI Builder

Reproduction steps:
1. Create a new project
2. Create > UI Toolkit > UI Document
3. Double-click UI Document to open UI Builder
4. Drag Button Element to the Hierarchy
5. Assign any Material in the Material section of the Inspector (e.g. “Default-ParticleSystem”)
6.  Observe the Console

Actual result: “d3d12: trying to draw without an active vertex or fragment program.” error is thrown
Expected result: No warnings or errors are thrown

Reproducible with: 6000.3.5f1, 6000.4.0b5, 6000.5.0a5
Couldn’t reproduce with: 6000.0.66f1 (Due to Material section not existing)

Reproduced on: Windows 11, macOS Sequoia 26.2 (M4)

Note:

• Issue is not reproducible more than once on the same project
• “Missing vertex input: normal, dummy data will be provided” error is thrown when assigning “Default-Diffuse”, “Default-Material”, “Default-Terrain-Diffuse”, “Default-Terrain-Specular” and “Default-Terrain-Standart” Materials in macOS
• “Metal: cannot write to unused constant buffer.” Error is thrown after assigning “Default-ParticleSystem” Material in macOS