C# readonly properties inaccessible from GDScript

[wscalf]

Godot version

v4.0.beta2.mono.official

System information

Linux Mint 20.3 Cinnamon

Issue description

I have C#-defined resources that get injected as exports into GDScript, and while methods, signals, and read/write properties surface as expected, it looks like readonly properties are not. Trying to access them results in errors like: Invalid get index 'str2' (on base: 'Node2D (TestNode.cs)').

This looks likely related to the code generator. This screenshot from my sample project shows that the read/write property has 4 references (from generated code) while the readonly property has zero:

Steps to reproduce

• Create a C# script that extends Resource or a node type. My actual project is using resources; the repro project extending Node2D
• Add a readonly property (using getter or lambda syntax) to the C# script. Note the lack of references from generated code.
• Create a GDScript with an export compatible with the C# script
• Import the C# script to the GDScript
• Try to access the readonly property from GDScript

Minimal reproduction project

ReadonlyPropertyRepro.zip