How to reproduce:
1. Create a new project with URP 3D Core Template
2. In the Project window, right click and create Input Actions
3. Select your new Input actions
4. In the Inspector window enable "Generate C# Class"
5. Observe the Console

Expected result: Console doesn't show errors
Actual result: After enabling "Generate C# Class" this error appears: 
Asset import failed, "Assets/New Actions.inputactions" > UnityException: Calls to "AssetDatabase.ImportAsset" are restricted during asset importing. Please make sure this function is not called from ScriptedImporters or PostProcessors, as it is a source of non-determinism.

Reproducible with: 1.15.0 (6000.4.0a2(417aa67423b3), 6000.4.0a3)
Not reproducible with: 1.15.0 (6000.0.60f1 (61dfb374e36f), 6000.2.8f1 (c9992ac36c34), 6000.3.0b7, 6000.4.0a1)

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