### 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)

}
		if (r_ret_type) {
			*r_ret_type = sf.return_type;
		}
		if (r_ret_type_str) {
			*r_ret_type_str = "";
		}
		return true;
	}
	bool failed_builtin = false;
	bool unsupported_builtin = false;
	int builtin_idx = 0;
	if (argcount <= 4) {
		
		int idx = 0;
		while (builtin_func_defs[idx].name) {
			if (completion_class != builtin_func_defs[idx].tag) {
				idx++;
				continue;
			}
			if (name == builtin_func_defs[idx].name) {
				failed_builtin = true;
				bool fail = false;
				for (int i = 0; i < argcount; i++) {
					if (p_func->arguments[i + 1]->type == Node::NODE_TYPE_ARRAY) {
						const ArrayNode *anode = static_cast<const ArrayNode *>(p_func->arguments[i + 1]);
						if (anode->call_expression == nullptr && !anode->is_indexed()) {
							fail = true;
							break;
						}