The first thing to consider is that there is no such thing as “faster than light”. The speed of light isn’t just the speed the fastest thing can go. It is the speed of causality. It is the rate at which time moves forward. As you approach that speed, time itself appears to slow down, and at the speed of light, it stops completely. It isn’t just extremely difficult to exceed the speed of light, it is physically impossible in our universe.

But let’s consider your question from the point of a wormhole. Say you are looking at Sirius (brightest star in Canis Major) and you are seeing what it looked like 8,000 years ago. Then, let’s say you step into a wormhole which transports you to that location instantly. The place you transport to will be 8,000 years later than the star you looked at at the start of your journey. If something happened in those intervening years (say, a supernova), the star won’t be there. But if you go back through the wormhole to return to earth, you would still look up and see Sirius.