### 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[i + 14] = a[i + 14];
						gui[i + 15] = a[i + 15];
					} else {
						gui[i] = 1;
						gui[i + 1] = 0;
						gui[i + 2] = 0;
						gui[i + 3] = 0;
						gui[i + 4] = 0;
						gui[i + 5] = 1;
						gui[i + 6] = 0;
						gui[i + 7] = 0;
						gui[i + 8] = 0;
						gui[i + 9] = 0;
						gui[i + 10] = 1;
						gui[i + 11] = 0;
						gui[i + 12] = 0;
						gui[i + 13] = 0;
						gui[i + 14] = 0;
						gui[i + 15] = 1;
					}
				}
			} else if (value.get_type() == Variant::TRANSFORM3D) {
				Transform3D v = value;
				gui[0] = v.basis.rows[0][0];
				gui[1] = v.basis.rows[1][0];
				gui[2] = v.basis.rows[2][0];
				gui[3] = 0;
				gui[4] = v.basis.rows[0][1];
				gui[5] = v.basis.rows[1][1];
				gui[6] = v.basis.rows[2][1];