1. Click on any MonoBehavior script you may have in your project
2. In the Inspector, you'll see two sections which we can create a preset from
- The Importer itself where it would save any import settings, in this case, there is nothing to preset as there is no options exposed for mono script import
- The MonoScript itself where the content of the script will be preset and can be applied to any other script (which isn't good)

Therefore, these two class type should simply be excluded from the preset system so the user isn't able to create preset for those cases.