On my survival world the nether is broken. When using flint and steel to activate nether portal it lights a fire and then doesn't activate the portal.

What I expected to happen was...:
The nether portal to work

What actually happened was...:
It just lit the obsidian on fire

Steps to Reproduce:
1. No known way. This has only affected one of my worlds. The world was created in survival and when switched to creative the problem continued
2. world seed this is affecting: -1821723879
3. world type set as: old