Reproduction steps:
1. Open the user's attached project "PrefabsHello.zip"
2. In the Project window select "PrefabA" prefab
3. Notice two PrefabA's script components "Script A" and "Script B" in the Inspector window
4. Open script "Script A", make a change inside the script, and save it
5. Go back to the Editor

Expected result: After recompiling both "Script A" and "Script B" script components are visible in the Inspector window
Actual result: After recompiling both "Script A" and "Script B" script components disappear in the Inspector window

Reproducible with: 2019.3.15f1, 2019.4.23f1, 2020.2.5f1
Not reproducible with: 2018.4.33f1, 2019.3.14f1, 2020.2.6f1, 2020.3.1f1, 2021.1.0f1, 2021.2.0a10

Notes:
-After re-selecting the prefab the scripts appear
-The issue reproduces if "Script B" is changed as well
-The issue only reproduces when the script components are on a Prefab