ScriptableObject's properties are not displayed in the Inspector Window when it's definition class is split in multiple files

Reproduction steps:
1. Open the “Duplicate Files Issue” Project
2. In the Project Window select “Assets/Foo” ScriptableObject
3. Observe the Inspector Window

Expected result: “Foo” ScritableObject’s properties are displayed in the Inspector Window
Actual result: “Foo” ScritableObject’s “Bar” and “Baz” properties are not displayed in the Inspector Window

Reproducible with: 2022.2.0a5, 2022.2.5f1, 2023.1.02b, 2023.2.0a3
Not reproducible with: 2020.3.44f1, 2021.3.18f1, 2022.2.0a4

Reproduce on: Intel MacOS 13.1

Note: If you select “Assets/_First Definition/Foo.cs” Script and select “Debug” in the Inspector Window, you can observe that the “Namespace” property is empty. The same is applied to “Assets/_Second Definition/Foo.cs” Script