Custom attribute on delegate return value not present in IL2CPP builds

Can find the custom attribute on the return parameter of the delegate fine in Editor, but not in IL2CPP builds (tested Windows x64). Looking at the stripped C# assemblies, it appears that the attribute was not stripped out.

Steps to reproduce:

1. Build attached reproduction project with IL2CPP backend

2. Run the built application

3. Check "player.log"

Actual results: 

Remote return type: __ret

Expected results: 

Remote return type: InputPromptResponse

Reproducible with versions: 

6000.0.0b15
2023.3.0b10
2023.2.18f1
2022.3.15f1
2021.3.37f1

Tested on (OS): 

Windows 10