The experimental tracking system that was heavily delayed and was a massive system on command ships becomes small enough to fit in a TIE cockpit, and even more efficient to actively track an enemy ship as it teleports from planet to planet to planet… all in less time it took to develop the previously-assumed to be impossible technology it was based on.
Why didn’t the iPhone 12 Pro Max come out in 1995?
You’re assuming the ships were being tracked from the TIEs, rather than the ship that deployed them.