Steps to reproduce:

1. Open any Project with the 2D PSD Importer package installed (this enables a dropdown menu to switch to something in the Texture Importer)
2. Import the attached PSD file
3. Select it in the Project Browser
4. In the Inspector switch the Importer type from Texture to PSD at the top of the Inspector
5. In the Inspector click the kebab menu icon in the top right corner (⋮) and select "Properties..."
6. In the newly opened Focused Inspector switch the Importer type at the top of the Inspector from PSD to Texture

Actual results: Errors "MissingReferenceException: The object of type 'UnityEditor.TextureImporter' has been destroyed but you are still trying to access it." & "The previous instance of UnityEditor.TextureImporterInspector has not been disposed correctly. Make sure you are calling base.OnDisable() in your AssetImporterEditor implementation." are logged when switching Importers and a focused Inspector is open

Expected results: Asset Importer is disposed properly and no Error is logged

Reproducible with versions: 2023.1.0a1, 6000.0.64f1, 6000.2.15f1, 6000.3.4f1, 6000.4.0b4, 6000.5.0a4

Tested on (OS): Windows 11