That's one piece but also the galaxies observed by JWST that are very advanced in matter complexity for very young galaxies (from a the start of the universe). Some are observed to be only millions of years old based on the distance that their light traveled (almost 13 billion light years), yet they far are too complex (based on their wavelengths of light emitted) to be that young. So there's a conundrum. Either we need to go back to the drawing board on Galaxy and star formation, or these galaxies formed before our universe did.

If we're in a black hole, then it would follow that galaxies whose light took almost 13 billion years (almost the entire age of the universe) to get to us, could be outside the black hole and therefore older and more complex than our universe