so after diving deeper into the nether crash that i was experiencing at my guardian farm i did some testing and i found out a way to replicate this issue. 

you need to force in 5 or more entities (i used cod) through a portal in the over world into the nether. then when you go through the portal the game will crash. it will allow you to go into a portal if its around 3000 blocks away but as soon as you go to the area of the other portal the game will crash. this is a very frustrating glitch as it completely breaks any functionality in the nether.