Steps to reproduce:
1. Open the attached project "AlphaChannelCubemap.7z"
2. Switch the Platform to Android
3. In the Project Window Click on either "masked_hdr.exr" or "masked_png.png
4. In the Inspector view Import Settings -> Texture Format (Ovveride for Android)
5. Observe that the format is "RGB(A) Compressed ASTC HDR 8x8 Block"
6. Toggle RGB/Alpha view with the icon at the bottom right, above the Preview window
7. Observe how Alpha Channel is discarded

Expected results: Alpha channel is displayed
Actual Results: The alpha channel is discarded

Reproducible in: 2021.3.29f1, 2022.3.6f1, 2023.1.5f1, 2023.2.0b1, 2023.3.0a1

Environment tested on: Windows 10

Notes:
-Switch to RGBA Half to see Alpha channel working as expected
-According to the Customer 2D textures are not affected