Dimension

I'm sorry to bother you. Today, I decided to report a bag that has been running for me for a long time. It's a question when I go to a certain dimension, and when I want to go back, it will not load me. Everything I see on the screen is the construction of the world. I have to go to task manager and turn off minecraft from the process. Please fix it. If you think it's a computer, here are my specifications. 6 gb RAM, dual-core 2.8 GHz processor and graphic nvdia gtk 480. Thanks for understanding.

What I expected to happen was...:
I just want to back home from nether.

What actually happened was...:
I didnt back cause bug.

Steps to Reproduce:
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