### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

}
			arg_list += arg_name;
		}
		_set_error(vformat(RTR("Invalid arguments for the built-in function: \"%s(%s)\"."), String(name), arg_list));
		return false;
	}
	
	StringName exclude_function;
	BlockNode *block = p_block;
	while (block) {
		if (block->parent_function) {
			exclude_function = block->parent_function->name;
		}
		block = block->parent_block;
	}
	if (name == exclude_function) {
		_set_error(RTR("Recursion is not allowed."));
		return false;
	}
	int last_arg_count = 0;
	String arg_list = "";
	for (int i = 0; i < shader->functions.size(); i++) {
		if (name != shader->functions[i].name) {
			continue;
		}
		if (!shader->functions[i].callable) {
			_set_error(vformat(RTR("Function '%s' can't be called from source code."), String(name)));
			return false;
		}
		FunctionNode *pfunc = shader->functions[i].function;