### 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)

#endif 
				tk = _get_token();
				if (tk.type == TK_IDENTIFIER) {
					st.name = tk.text;
					if (shader->constants.has(st.name) || shader->structs.has(st.name)) {
						_set_redefinition_error(String(st.name));
						return ERR_PARSE_ERROR;
					}
					tk = _get_token();
					if (tk.type != TK_CURLY_BRACKET_OPEN) {
						_set_expected_error("{");
						return ERR_PARSE_ERROR;
					}
				} else {
					_set_error(RTR("Expected a struct identifier."));
					return ERR_PARSE_ERROR;
				}
				StructNode *st_node = alloc_node<StructNode>();
				st.shader_struct = st_node;
				int member_count = 0;
				HashSet<String> member_names;
				while (true) { 
#ifdef DEBUG_ENABLED
					keyword_completion_context = CF_DATATYPE | CF_PRECISION_MODIFIER;
#endif 
					tk = _get_token();
					if (tk.type == TK_CURLY_BRACKET_CLOSE) {
						break;
					}
					StringName struct_name = "";