The main problem with Thunderbolt that it has different security levels and when a device is not autorized then Unraid can't detect it because it's not autorized.   Unraid is capable of Thunderbolt and can query the security level, is also capable of autorizing the device and seeing it on the Kernel level since it's implemented but a userspace tool is missing to authorize the device so that you or better speaking Unraid can detect and see it.