This bug has happened twice already. It all started when me and my friends were using our portal system to travel to the Overworld, but when we went through the portal, we fell into the void. We later came back to this area in our world and saw that there was a giant hole that digs through bedrock almost the size of 15 chunks. The last time this happened was a couple of days ago but this time, it happened right on top of a village an was smaller. This is actually a pretty easy way to get diamonds and all, but I thought it was about time I reported it. I hope this is fixed at some point, cause I hope I don't get the same fate I got the first time.