### 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)

List<PropertyInfo> none_subgroup;
						none_subgroup.push_back(info);
						HashMap<String, List<PropertyInfo>> subgroup_map;
						subgroup_map.insert("<None>", none_subgroup);
						groups.insert(last_group, subgroup_map);
						vgroups.push_back(Pair<String, LocalVector<String>>(last_group, { "<None>" }));
					}
					if (!groups[last_group].has(last_subgroup)) {
						PropertyInfo info;
						info.usage = PROPERTY_USAGE_SUBGROUP;
						info.name = last_subgroup.capitalize();
						info.hint_string = "shader_parameter/";
						List<PropertyInfo> subgroup;
						subgroup.push_back(info);
						groups[last_group].insert(last_subgroup, subgroup);
						for (Pair<String, LocalVector<String>> &group : vgroups) {
							if (group.first == last_group) {
								group.second.push_back(last_subgroup);
								break;
							}
						}
					}
				} else {
					last_group = "<None>";
					last_subgroup = "<None>";
					is_none_group = true;
				}
				continue; 
			}
			if (is_none_group_undefined && is_none_group) {