Reproduction steps:
1. Open the attached project "ConstantBufferUpdateIssue.zip"
2. Go to Player Settings and set the Graphics API to Vulkan
3. Enter Play Mode and observe the correct render result
4. Go to Player Settings and set the Graphics API to DirectX11
5. Enter Play Mode and observe the render result

Expected result: Two rows of white cubes are rendered
Actual result: Rendered white cubes are scattered around randomly

Reproducible with: 2019.4.35f1, 2020.3.28f1, 2021.2.11f1, 2022.1.0b9, 2022.2.0a5

Notes:
-Issue is also reproducible when Graphics API is set to DirectX12
-The render result is different each time when entering Play Mode when Graphics API is set to DirectX11 or DirectX12
-Issue is not reproducible when Graphics API is set to Vulkan, OpenGLES3, OpenGLCore
-Issue is not reproduced on Android. Two rows of white cubes are rendered correctly
-Issue is not reproduced on macOS12.2 (Metal) but reproduced on macOS 12.2 (OpenGLCore)