Custom resources with _init with parameters defined turns into null

[asdfer-1234]

Godot version

godot 4.0 beta 13 (caacade)

System information

Windows 10

Issue description

Custom resources with _init defined with parameters turns into null on start
If _init does not have parameters, this issue wont happen

Steps to reproduce

1. Make a custom resource
2. Define an _init on the custom resource with parameters on it
3. Have a Node that stores the custom resource non-null
4. Run Project

Minimal reproduction project

minimalreproductionproject.zip

[YuriSizov]

If your class doesn't have a parameter-less constructor, then the engine has no idea how to deserialize and initialize it. It doesn't know what to pass to the constructor, and thus it cannot create an instance. Making your arguments optional should work.

See also godotengine/godot-proposals#1513 and godotengine/godot-proposals#5899.