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.
Thank you for your report!
We're actually already tracking this issue at MCPE-66678, so I will resolve and link this ticket as a duplicate.
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