Steps to reproduce:
1. Create a new project or open an existing one
2. Right-click in the Assets area of Project View
3. Select "Import New Asset..."
4. Select Photos, Movies or Music from Media Category in the left sidebar

Reproducible with: 2019.4.13f1, 2020.1.10f1, 2020.2.0a16
Not reproducible with: 2018.4.28f1, 2020.2.0a17, 2020.2.0b8, 2021.1.0a1

First lines of the stacktrace:
#0 0x007fff6acd9ad6 in __abort_with_payload
Thread 0x700002a75000 may have been prematurely finalized
#1 0x007fff6acdb411 in __darwin_check_fd_set_overflow.cold.1
Thread 0x700002a75000 may have been prematurely finalized
#2 0x007fff613ac59f in TCCAccessRequestIndirect
Thread 0x700002a75000 may have been prematurely finalized
#3 0x007fff613aa531 in __TCCAccessCheckAuditToken_block_invoke
Thread 0x700002a75000 may have been prematurely finalized

Notes:
- Not reproducible with MacOS 11.0 20A5364e Big Sur
- Reproducible with MacOS 10.15.6 and 10.15.7

Reset all macOS permissions for Unity with:
tccutil reset All com.unity3d.UnityEditor5.x