Asset import worker crash on "get_index_for_key" when building asset search index for the first time

How to reproduce:
1. Open the attached “IN-142106“ project
2. Wait for ~30 seconds
3. Observe the crash

Reproducible with: 6000.6.0a4 (77e2e2eea1be), 6000.6.0a5
Not reproducible with: 6000.0.75f1, 6000.3.16f1, 6000.4.8f1, 6000.5.0b9, 6000.6.0a3

Reproduced on: Windows 11
Not reproduced on: No other environment tested

Note: The project must be re-extracted each time

First few lines of the stack trace:
0x00007FFD13EB71CD (Unity) get_index_for_key
0x00007FFD13EB76FC (Unity) get_value_for_key
0x00007FFD13EB9D8F (Unity) uds_hashmap_get
0x00007FFD13ED27E2 (Unity) uds_internal_get_content_size
0x00007FFD13EEB686 (Unity) UDSFileSystem::Size