I use WesterosCraft texture pack and three downloaded maps of KingsLanding, Winterfell, and the Dreadfort. All three worlds are very large and full. Every time I have tried to load those three singleplayer games the game will load for roughly 10 seconds then the screen will turn blue and the entire game will crash giving me these JIRA Issues: MC-103978 MC-103981.

What I expected to happen was...:
I would load minecraft up, go to the singleplayer tab, and join one of the worlds that are causing me issues, I expected it to load, and have the game slowly but surely render in and be able to play.

What actually happened was...:
I loaded a game up and it loaded for 5 second then crashed

Steps to Reproduce:
1. Load minecraft, and click on the single player tab
2. Click a world and let it load up
3. Wait for the crash