### 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_BRACKET_OPEN) {
						Error error = _parse_array_size(nullptr, constants, true, nullptr, &arg_array_size, nullptr);
						if (error != OK) {
							return error;
						}
						tk = _get_token();
					}
					arg.array_size = arg_array_size;
					func_node->arguments.push_back(arg);
					if (tk.type == TK_COMMA) {
						tk = _get_token();
						
					} else if (tk.type != TK_PARENTHESIS_CLOSE) {
						_set_expected_error(",", ")");
						return ERR_PARSE_ERROR;
					}
				}
				if (p_functions.has(name)) {
					
					if (func_node->arguments.size() > 0) {
						_set_error(vformat(RTR("Function '%s' expects no arguments."), String(name)));
						return ERR_PARSE_ERROR;
					}
					if (func_node->return_type != TYPE_VOID) {
						_set_error(vformat(RTR("Function '%s' must be of '%s' return type."), String(name), "void"));
						return ERR_PARSE_ERROR;
					}
				}