I am the host. I built a mob grinder in the sky. I made sure my main redstone was in complete chunks. I have a hopper train sorting items (no water stream) all within loaded chunks as I Afk. There's a large water elevator(magma block / soul sand) going into the chest room from ground with another smaller elevator going into the afk room from there. If I try to leave the afk room into the elevator I will crash. Others can come to me and leave with no problems. I've loaded in with my son's account on a Xbox S (last gen) and he's fine. I've checked the hoppers with his account and there's no back up of items as I have a over flow that burns items. The system isn't really that stressed with items regardless since mob caps in bedrock are not that great. If I try to leave the area with my son next to me I still crash even though he's fine. 

Considering my son can load into the game and area on a previous generation console; this crashing the system bug seems related to new generation consoles.