Reproduction steps:
1. Open the “DepthNormalWebGL“ project
2. Open the “SampleScene“ scene
3. Build And Run
4. Observe the rightmost quad

Expected result: The quad uses the texture’s alpha and displays a green x
Actual result: The quad is fully green

Reproduced in: 2021.3.29f1, 2022.3.6f1, 2023.1.7f1, 2023.2.0b3

Reproduced using: macOS 13.4.1 (Intel), Windows 10

Notes:
1. Reproduced in StandaloneOSX and WebGL
2. Not reproduced in Editor and Play Mode
3. The reporter uses _CameraDepthNormalsTexture in their post effect for opaque materials with cutouts (leaves)