### 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)

case 'p':
								case 'q':
									if (color_symbols.size() > 0 || position_symbols.size() > 0) {
										mix_error = true;
										break;
									}
									if (!texture_symbols.has(c[i])) {
										texture_symbols.insert(c[i]);
									} else {
										repeated = true;
									}
									break;
								default:
									ok = false;
									break;
							}
						}
					} break;
					default: {
						ok = false;
					}
				}
				if (mix_error) {
					_set_error(vformat(RTR("Cannot combine symbols from different sets in expression '.%s'."), ident));
					return nullptr;
				}
				if (!ok) {
					_set_error(vformat(RTR("Invalid member for '%s' expression: '.%s'."), (dt == TYPE_STRUCT ? st : get_datatype_name(dt)), ident));
					return nullptr;
				}