Crash on ExternalMaterialsCreationPostprocessCallback when importing specific asset

Reproduction steps:
1. Create and open a new 3D HDRP project
2. Download and import the “Neon City - Synthwave” asset (https://assetstore.unity.com/packages/3d/environments/sci-fi/neon-city-synthwave-253637 )
3. Observe the crash

Reproducible in: 6000.0.23f1, 6000.0.33f1, 6000.1.0b1
Not reproducible in: 2021.3.47f1, 2022.3.55f1, 6000.0.22f1

Reproducible on: Windows 11
Not reproducible on: No other environments tested

First few lines of stacktrace:

0x00007FFD508CABC1 (Unity) ExternalMaterialsCreationPostprocessCallback
0x00007FFD4FEA1927 (Unity) Postprocess
0x00007FFD4FEB58E5 (Unity) CallPostProcessAllAssetsCallbacks
0x00007FFD4FED0827 (Unity) ProcessPostProcessAllAssetNotificationsAndHotReload
0x00007FFD4FEDD3BF (Unity) StopAssetImportingV2Internal
0x00007FFD4FED4A3C (Unity) RefreshV2

Note: Reproducible only once for each new project