I was flying around and exploring in creative mode and found a ruined portal half buried in netherrack.

Template: way of the nether

biome: nether

location: 294 91 -659. Look around until you see it.

you can’t change the way a template generates, but maybe you could stop this from happening in the future.
I didn’t mean to put the coordinates as a link, it just happened automatically
If you teleport there in survival mode you will fall into a sea of lava and burn