Different sizes are shown for ASTC type textures between the Texture Importer Preview window and the Memory Profiler window

To reproduce:
1. Download attached "TextureTest.zip" project in Unity
2. Open "SampleScene" scene
3. Select "wall" Texture
4. In the Texture Preview Window notice the Size of the Image - it should be around 200 - 300 KB
5. Open Profiler and select Memory tab
6. Press "Take Sample Playmode" button
7. Inspect "Assets > Texture2D > wall" Memory Size

Expected results: The Size shown in the Texture Importer Preview window is similar to the Memory Profiler window
Actual results: The Size shown in the Memory Profiler window is almost twice as large as the Texture Importer Preview window

Notes:
- Checked only on macOS cause I don't have Windows machine with me

Reproduced on 2019.4.7f1, Unity 2020.1.1.f1 and 2020.2.0a20
Not reproduced on 2019.4.6, Unity 2020.1.0f1
Regression on Unity 2020.1.1.f1

Note:
This is partially "By Design". The Inspector Preview currently shows the file size on disk.
This is unclear and misleading and some texture compression sizes are just wrongly calculated right now, which is the bug part.