MonoScript.GetClass returns null when the script contains a struct inside a namespace or an interface inside a namespace

Steps to reproduce:
1. Open the “MonoScriptGetClassIssue” project
2. Select Tools -> Type Interface Check in the Menu Bar
3. Select "IWithNamespace" script in the Data Script and observe the results in the Interface Check window
4. Select "WithNamespaceStruct" script in the Data Script and observe the results in the Interface Check window

Expected result: when "IWithNamespace" is selected, the text "Type: IWithNamespace" occurs and when "WithNamespaceStruct" is selected, the text "Type: WithNamespaceStruct" occurs
Actual result: in both cases the text "Error: Type not found in the specified script" occurs

Reproducible with: 2020.3.45f1, 2021.3.19f1, 2022.2.0a2
Not reproducible with: 2022.2.0a3, 2022.2.7f1, 2023.1.0b4, 2023.2.0a3

Reproduced on: macOS Monterey 12.2 (Intel)