Put the summary of the bug you're having here
What I expected to happen was the Nether portal in the Nether would explode and the portals would merge as they were the only two left
What actually happened was.... I was trying to merge portals, I made a contraption that would hopefully destroy the Nether portal (TNT) and I would be teleported to "the main world" and in the end I had to keep in the Nether for time to pass as the TNT would only explode as I ventured back seeing if it worked it just exploded in my face.
Steps to Reproduce:
1. Consistent game playing
2. Build Nether Portal
3. Then teleport between world (frequently) and searching between worlds.
Works As Intended
The Nether world gets unloaded when you leave it, therefor the TNT doesn't explode. It explodes when you enter the Nether again.