Star Wars: The Rise of Skywalker had attempted the impossible by trying to be the end of a total of nine movies, and I think everyone agrees that they didn't really stick the landing. The production value is still great though, and some concept art from the film actually reveals a neat Episode I callback.
This comes from Lucasfilm's Phil Szostak who shares this concept of 3PO on Babu Frik's work bench:
If you recall, that's C-3PO's face from The Phantom Menace when he was still being built by young Anakin Skywalker on Tatooine. It would have definitely been a great callback and would have been neat to bookend 3PO's story in the saga with us seeing what's beneath the gold plating.
We don't really know why they didn't use this concept, but some think it was because they wanted Anthony Daniels to be in the suit when they did this scene. While I was honestly fine with the scene as it is, I'm now kind of a little disappointed that this is the callback we didn't get. Then again, what was The Rise of Skywalker but an endless sea of callbacks from Luke's X-Wing to Chewbacca getting a medal?
For now the Star Wars franchise is looking to go on hiatus with a theatrical film set to come out in 2022. Personally I would have loved to continue with the anthology films, but with Disney+ providing less risk for Lucasfilm, it would make sense they would just release the more experimental material there.
Catch The Mandalorian Season 2 when it comes out on Disney+ this October.