Steps to reproduce:

1. Ensure you have a Prefab in the Project Window
2. Select the Prefab
3. In the Inspector, click Add Component button to create a new script (e.g testScript)
4. Observe the console

\\
Actual results: "Error while saving Prefab: 'Assets/Cube.prefab'. You are trying to save a Prefab that contains the script '', which does not derive from MonoBehaviour. This is not allowed. Please change the script to derive from MonoBehaviour or remove it from the GameObject 'Cube'. UnityEditor.PrefabImporterEditor:OnDisable ()"

Expected results: No error should occur if the script inherits from MonoBehaviour. The script should be added to the prefab without issue

\\
Reproducible with versions: 2021.3.53f1, 2022.3.63f1, 6000.0.52f1, 6000.1.11f1, 6000.2.0b9

\\
Tested on (OS): macOS 15.6 Silicon