C#, Changed event in a custom Resource with [Tool] does not reset properly on Build

[jinsediaoying]

Godot version

4.2beta4, 4.1.2

System information

Godot v4.2.beta4.mono - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 4070 (NVIDIA; 31.0.15.3667) - 13th Gen Intel(R) Core(TM) i5-13600KF (20 Threads)

Issue description

C#, Changed event in a custom Resource with [Tool] does not reset properly on Build, and it throw some errors, and cause repeated event subscribe

Steps to reproduce

1. create a resource object with MyResource script attached
2. change code a bit, then Build the project
3. you will see errors after Build, and if you do step multiple times, when you change the X in the editor, you will notice that
   OnChanged method get invoked multiple times

Minimal reproduction project

BugReport.zip

[raulsntos]

• Sounds like a duplicate of Can't get method on CallableCustom "Delegate::Invoke" error when building/debugging .NET project #70026.