### 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)

}
			tk = _get_token();
			if (tk.type == TK_COMMA) {
				an->initializer.push_back(n);
			} else if (!auto_size && tk.type == TK_PARENTHESIS_CLOSE) {
				an->initializer.push_back(n);
				break;
			} else if (auto_size && tk.type == TK_CURLY_BRACKET_CLOSE) {
				an->initializer.push_back(n);
				break;
			} else {
				if (auto_size) {
					_set_expected_error("}", ",");
				} else {
					_set_expected_error(")", ",");
				}
				return nullptr;
			}
		}
		if (an->initializer.size() != p_array_size) {
			_set_error(RTR("Array size mismatch."));
			return nullptr;
		}
	} else {
		_set_error(RTR("Expected array initialization."));
		return nullptr;
	}
	return an;
}
ShaderLanguage::Node *ShaderLanguage::_parse_expression(BlockNode *p_block, const FunctionInfo &p_function_info) {