Reproduction steps:
1. Create a new project
2. From Hierarchy drag any GameObject to the Project window to make a prefab
3. Right-click on it and go Export Package -> Export and choose save location, save
4. Delete the prefab in Unity
5. Try to drag the prefab from the OS file browser into the Unity Project window

Expected result: the asset gets imported
Actual result: nothing happens

Reproducible with: 2019.4.33f1, 2020.3.24f1, 2021.2.4f1, 2022.1.0a1, 2022.1.0a16

Was able to repro with with Windows and version 2022.1.0a13 (my currently latest installed version). This is fixed on Windows in 2022.2.0a1.176.

Tested on Mac:
Does not repro with : latest 22.2, 21.2.7f1, 20.3.25f1, 2019.4.34f1