Netherportal disappears in the nether

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I played with my daughter in our Minecraft world. My daughter built a nether portal and went into the nether. She went exploring near the Netherspawn. I got a few more things from our house. When I was on my way to the portal, my daughter said the portal was completely gone. Since we're playing in split screen, I was able to see it for myself. It was completely gone. So I got obsidian from the house and went through the portal afterwards. But I haven't arrived. Both arrived and exited the world spawn. Portal in the Overworld was still activated. When I re-entered alone, it was the nether spawn my daughter had too.

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However, this issue has been temporarily closed as Awaiting Response.

Could you please export and attach the world in which you experienced the issue?

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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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