Why are two of the same components listed in my inspector?

Questions & Answers
1

Only one SceneChangeEvent.cs script exists in my project.

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2

Try adding them both as components to a GameObject and checking where each one leads (you can do that by clicking on them after they’re in your GameObject), maybe you have a leftover in one of your sub-folders.

3

Rebooting unity, it was solved.
I wander if there were broken meta files in my project.
Thanks a lot.