### 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)

found = true;
									break;
								}
							}
						}
					}
					if (!found) {
						_set_error(vformat(RTR("Invalid render mode: '%s'."), smode));
						return ERR_PARSE_ERROR;
					}
					shader->render_modes.push_back(mode);
					tk = _get_token();
					if (tk.type == TK_COMMA) {
						
					} else if (tk.type == TK_SEMICOLON) {
						break; 
					} else {
						_set_error(vformat(RTR("Unexpected token: '%s'."), get_token_text(tk)));
						return ERR_PARSE_ERROR;
					}
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_GLOBAL_SPACE;
#endif 
			} break;
			case TK_STRUCT: {
				ShaderNode::Struct st;
				DataType type;
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;