The wrong Component/Class gets added when adding a Nested Class via Script that has a duplicate Class elsewhere

Unity: Scripting

2023.1.X

2022.2.X

2022.1.X

2021.3.X

2020.3.X

Fixed in: 2023.1.0a9

Fixed in: 2022.2.0b8

Fixed in: 2022.1.18f1

Fixed in: 2021.3.11f1

Fixed in: 2020.3.41f1

How to reproduce:
1. Open the user-attached “YouHaveToBeKiddingMeBro.zip” project
2. Enter Play Mode

Expected result: “Added the correct type” is printed
Actual result: “Added the wrong type” is printed

Reproducible with: 2020.3.36f1, 2021.3.6f1, 2022.1.9f1, 2022.2.0b1, 2023.1.0a3

Reproduced on: macOS Monterey 12.0.1

Note:

If “Enter Play Mode Options” is turned off the issue is not reproducible (Edit → Project Settings → Editor)
If “Reload Domain” is turned on the issue is not reproducible (Edit → Project Settings → Editor)
If the issue is not reproducing, re-opening the project forces the issue to reproduce once again
Reimporting or making any change to the script fixes the issue unless you re-open the project
Reproducible on a new project