I was doing my regular game things and went to the nether.  But, when i tried to return to my main spawn portal, my game stuck and crashed in the Generating World and crashed. I am using beta 1.16.0.55 or NETHER UPDATE. 

 I copied the world and build another portal far from the original one in creative mode and as long as i didnt loaded my spawn chunk, the game worked all fine, like nothing has happened at all.