Show Overview gives empty Tree Views in Import Activity window

Steps to reproduce:

1. Create new Unity project
2. Open Import Activity window (by selecting menu->Assets->View In Import Activity Window)
3. In Import Activity window press "Show Overview" button

Actual results: The Overview window is opened, but all Tree Views are empty - see attached screenshot

Expected results: The Overview window is opened and Tree Views are populated with data

Reproducible with versions: 6000.6.0a3, 6000.6.0a4

Not reproducible with versions: 6000.5.0b5

Can’t test with versions: - 

Tested on (OS):  Windows 11

Notes:

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