Editor crashes on changing the texture of Face/Outline property of Material Presets shader in TextMesh-Pro with Direct3D12 Graphics APIs.

Steps to repro:
1. Create a new project.
2. Windows > TextMeshPro > Import TMP Essential Resources.
3. Windows > TextMeshPro > Import TMP Examples and Extras.
4. Change Graphics API to Direct3D12.
5. GameObject > 3D Object > Text-TextMeshPro.
6. Change Material Preset to "LiberationSans SDF - Metalic Green".
7. Change Texture of "Face" property to "Anton SDF Atlas".

Actual Result:
Editor crashed.

Expected Result:
The texture should be changed.

Reproducible on:
2020.1.0a10, 2019.3.0b8, 2019.2.0f1, 2019.2.0a7.

Working Fine in:
2019.2.0a5.

NOTE: Could not test on 2019.2.a6 due to Editor crashes on changing Graphics APIs to Direct3D12.

Environment:
Only on Windows 10.