### 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)

if (defined_modes.has(name)) {
												_set_error(vformat(RTR("Redefinition of render mode: '%s'. The '%s' mode has already been set to '%s'."), smode, name, defined_modes[name]));
												return ERR_PARSE_ERROR;
											}
											defined_modes.insert(name, smode);
											break;
										}
									} else {
										found = true;
										break;
									}
								}
							}
						}
					} else {
						for (int i = 0; i < p_render_modes.size(); i++) {
							const ModeInfo &info = p_render_modes[i];
							const String name = String(info.name);
							if (smode.begins_with(name)) {
								if (!info.options.is_empty()) {
									if (info.options.has(smode.substr(name.length() + 1))) {
										found = true;
										if (defined_modes.has(name)) {
											_set_error(vformat(RTR("Redefinition of render mode: '%s'. The '%s' mode has already been set to '%s'."), smode, name, defined_modes[name]));
											return ERR_PARSE_ERROR;
										}
										defined_modes.insert(name, smode);
										break;
									}
								} else {