### 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 'r':
								case 'g':
								case 'b':
								case 'a':
									if (position_symbols.size() > 0 || texture_symbols.size() > 0) {
										mix_error = true;
										break;
									}
									if (!color_symbols.has(c[i])) {
										color_symbols.insert(c[i]);
									} else {
										repeated = true;
									}
									break;
								case 'x':
								case 'y':
								case 'z':
								case 'w':
									if (color_symbols.size() > 0 || texture_symbols.size() > 0) {
										mix_error = true;
										break;
									}
									if (!position_symbols.has(c[i])) {
										position_symbols.insert(c[i]);
									} else {
										repeated = true;
									}
									break;
								case 's':
								case 't':