### 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)

gui[2] = v.z;
					gui[3] = v.w;
				} else if (value.get_type() == Variant::VECTOR4) {
					Vector4 v = value;
					gui[0] = v.x;
					gui[1] = v.y;
					gui[2] = v.z;
					gui[3] = v.w;
				} else {
					Plane v = value;
					gui[0] = v.normal.x;
					gui[1] = v.normal.y;
					gui[2] = v.normal.z;
					gui[3] = v.d;
				}
			}
		} break;
		case ShaderLanguage::TYPE_MAT2: {
			float *gui = (float *)data;
			if (p_array_size > 0) {
				const PackedFloat32Array &a = value;
				int s = a.size();
				for (int i = 0, j = 0; i < p_array_size * 4; i += 4, j += 8) {
					if (i + 3 < s) {
						gui[j] = a[i];
						gui[j + 1] = a[i + 1];
						gui[j + 4] = a[i + 2];
						gui[j + 5] = a[i + 3];
					} else {
						gui[j] = 1;