### 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)

HashSet<String> kws;
	int idx = 0;
	while (keyword_list[idx].text) {
		kws.insert(keyword_list[idx].text);
		idx++;
	}
	idx = 0;
	while (builtin_func_defs[idx].name) {
		kws.insert(builtin_func_defs[idx].name);
		idx++;
	}
	for (const String &E : kws) {
		r_keywords->push_back(E);
	}
}
bool ShaderLanguage::is_control_flow_keyword(String p_keyword) {
	return p_keyword == "break" ||
			p_keyword == "case" ||
			p_keyword == "continue" ||
			p_keyword == "default" ||
			p_keyword == "do" ||
			p_keyword == "else" ||
			p_keyword == "for" ||
			p_keyword == "if" ||
			p_keyword == "return" ||
			p_keyword == "switch" ||
			p_keyword == "while";
}
void ShaderLanguage::get_builtin_funcs(List<String> *r_keywords) {