The ship no longer appears on our scopes.
No ship that small has a cloaking device.
So, we are to assume that A) the Star Wars galaxy has Star Trek-esque cloaking devices and B) that the device is large so small ships can't install them.
C) Star Destroyers are immense, so we should be able to assume that they CAN have cloaking devices. With that in mind, why wouldn't Ozzel use the cloaking devices to hide the Star Destroyers as they come out of Hyperspace near Hoth?