I always wondered what happens below the Planck"s length or time. I don't know is my answer.
I don't know is a good answer to that question.
Is it possible that we are in a simulation? Yes, but the chances of it being so are pretty much close to zero.
I don't know would be a better answer here as well.
The available data fits the simulation/holographic model surprisingly well. That does not mean it is reality only that the possibility should not be casually dismissed.
It behoves us to remember that sometimes reality is more complex and mysterious then we initially believe.
When Copernicus's first published his works on a heliocentric solar system it was received by many as a mathematical trick. A way of simplifying the math when calculating the position of planets in a geocentric universe nothing more.
Only with time did the new and obscure mathematical ideas overcome the entrenched and widely held but erroneous "common sense" beliefs of the era.
It is not impossible that materialism could turn out to be the modern equivalent of geocentricism. Wisdom necessitates humility in the face of our limited science and understanding.