Create nether portal

Use nether portal fine

*for a while...

Nether portal breaks, un-known reason.

Maybe a mob went threw and is blocking other side of portal. No animation of travel plays when contacting the texture. Relighting portal does not fix.

Gif:
https://drive.google.com/file/d/1_azjqtsgerOtPns9pOQghg2xuqHHjbAu/view?usp=sharing