### 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 (i + 3 < s) {
							gui[i] = a[i];
							gui[i + 1] = a[i + 1];
							gui[i + 2] = a[i + 2];
							gui[i + 3] = a[i + 3];
						} else {
							gui[i] = 0;
							gui[i + 1] = 0;
							gui[i + 2] = 0;
							gui[i + 3] = 0;
						}
					}
				}
			} else {
				if (value.get_type() == Variant::COLOR) {
					Color v = value;
					gui[0] = v.r;
					gui[1] = v.g;
					gui[2] = v.b;
					gui[3] = v.a;
				} else if (value.get_type() == Variant::RECT2) {
					Rect2 v = value;
					gui[0] = v.position.x;
					gui[1] = v.position.y;
					gui[2] = v.size.x;
					gui[3] = v.size.y;
				} else if (value.get_type() == Variant::QUATERNION) {
					Quaternion v = value;
					gui[0] = v.x;
					gui[1] = v.y;