### 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)

return ERR_PARSE_ERROR;
										}
									}
									StringName struct_name2;
									DataType type2;
									if (shader->structs.has(tk.text)) {
										type2 = TYPE_STRUCT;
										struct_name2 = tk.text;
									} else {
										if (!is_token_variable_datatype(tk.type)) {
											_set_error(RTR("Invalid data type for the array."));
											return ERR_PARSE_ERROR;
										}
										type2 = get_token_datatype(tk.type);
									}
									int array_size2 = 0;
									tk = _get_token();
									if (tk.type == TK_BRACKET_OPEN) {
										bool is_unknown_size = false;
										Error error = _parse_array_size(nullptr, constants, false, nullptr, &array_size2, &is_unknown_size);
										if (error != OK) {
											return error;
										}
										if (is_unknown_size) {
											array_size2 = constant.array_size;
										}
										tk = _get_token();
									} else {
										_set_expected_error("[");
										return ERR_PARSE_ERROR;