Remember that time when the zombie apocalypse happened and no one noticed except the author of Matthew?

Why didn't any contemporary sources make mention of the zombie apocalypse in Matthew?

At that moment the veil of the temple was torn in two from top to bottom. The earth quaked and the rocks were split. The tombs broke open, and the bodies of many saints who had fallen asleep were raised.
After Jesus’ resurrection, when they had come out of the tombs, they entered the holy city and appeared to many people


Many dead saints got up and went into Jerusalem where they were seen by many people...and this didn't get recorded anywhere except the bible?
Where are the extra-biblical records of this amazing event? Heck, even Mark, Luke and John missed that one.