[TOMT] [Short Story] Scientists create virtual life, then find out they are just a simulation as well

I read this short story a few years back (don't exactly remember when) on some random website. I remember most of the details pretty completely, but haven't been able to find a link to it ever since.

Here is my recreation from memory:

A few scientists are working in a lab. They have successfully created simulated life in a super computer and one of them was programming in a virtual "viewport" to allow an omniscient-like ability to view anything at any angle anywhere within their simulated world.

Once it is complete, they speed up time within the simulation to watch the progression of the artificial life. It eventually catches up to the present day and the scientists discover that everything, even right down to themselves working in a lab experimenting with artificial life, has been faithfully recreated in their simulation. So essentially at this point they are watching themselves who are also watching their own created life. They are astonished how they were able to basically create themselves who in turn created themselves ad infinitum.

One of the scientists has a horrible feeling and then decides to do an experiment. He (she?) programs in something impossible within the normal bounds of the simulated world: a spherical void, right next to the simulated scientists. At that same moment, the void appears within their own world as well.

Because of this outcome, one of the scientists suggests that they were not the origin at all and are themselves just part of another higher level simulation. It then gets a bit philosophical about how there are literally an infinite number of levels below the "real" world being simulated simultaneously, and it was arrogant of them to assume that they were the one "true" world to begin with given the astronomical probability otherwise.

It ends with them deciding if they should shut down their simulation or not and if that would essentially mean the end of their existence since the higher level was probably thinking the same thing.