### Godot version

4.0.2

### System information

Windows 10

### Issue description

If an error in the Debugger/Errors menu caused by a C# script is selected every time the project is executed a "Save Resource As" menu appears.
![Erro1](https://user-images.githubusercontent.com/6534007/234107005-1455895e-50d3-452a-b153-dae219f98211.PNG)
![Erro2](https://user-images.githubusercontent.com/6534007/234107008-315b7fed-d0ef-4573-ad76-9f0992f83a51.PNG)


The only way to stop it for appearing is restarting Godot.

### Steps to reproduce

1. Execute a C# script with an error
2. Select the error in the Debugger/Errors menu
3. Click "run project"
4. A "Save Resource As" menu appears.

### Minimal reproduction project

Example code with error:

```csharp
using Godot;
using System;

public partial class ErrorTest : Node 
{
    public override void _Ready() 
    {
        Node nullNode = null;

        nullNode.ToString();
    }
}


```


while (ci) {
				text += "  " + ci->get_text(0).rpad(rpad_len) + ci->get_text(1) + "\n";
				ci = ci->get_next();
			}
			DisplayServer::get_singleton()->clipboard_set(text);
		} break;
		case ACTION_OPEN_SOURCE: {
			TreeItem *ti = error_tree->get_selected();
			while (ti->get_parent() != error_tree->get_root()) {
				ti = ti->get_parent();
			}
			
			
			TreeItem *ci = ti->get_first_child();
			const String cpp_source = "<" + TTR("C++ Source") + ">";
			while (ci) {
				if (ci->get_text(0) == cpp_source) {
					break;
				}
				ci = ci->get_next();
			}
			if (!ci) {
				WARN_PRINT_ED("No C++ source reference is available for this error.");
				return;
			}
			
			const Vector<String> file_line_number = ci->get_text(1).split("@")[0].strip_edges().split(":");
			ERR_FAIL_COND_MSG(file_line_number.size() < 2, "Incorrect C++ source stack trace file:line format (please report).");
			const String file = file_line_number[0];
			const int line_number = file_line_number[1].to_int();