Reproduction steps:
1. Create a new Unity project
2. Import "Example.wav" into the project
3. Select the .wav file in the Project window

Expected result: there are no errors in the console
Actual result: an error is thrown "Unknown platform passed to AudioImporter.GetOverrideSampleSettings (Server)..."

Reproducible with: 2021.2.0a20, 2021.2.0b6, 2022.1.0a4
Not reproducible with 2019.4.29f1, 2020.3.15f2, 2021.1.16f1, 2021.2.0a19

Notes:
1. This does not affect Play Mode, the audio files themselves work fine
2. Reproduced with .wav and .mp3 formats (did not test any other)

Full error:
Unknown platform passed to AudioImporter.GetOverrideSampleSettings (Server)
UnityEditor.AssetImporters.AssetImporterEditor:InternalSetTargets (UnityEngine.Object[]) (at /Users/bokken/buildslave/unity/build/Modules/AssetPipelineEditor/ImportSettings/AssetImporterEditor.cs:281) error when selecting a wav file in project window.