During the last two Sunday Community Meetups (60-80ppl) we've had issues where the portals just gets removed.
Not really been able to track down the cause. Only common cause between these two days is that they've all been filled up to max slot (80) and that at some point after telling people to join next world via link was I able to drop a portal successfully.
It can be seen in the video here, as the person places the portal on the stage and after a few seconds is disappears: https://youtu.be/58hW2wSbhkc?t=740
Happens several times throughout the event.
I was however told that it was (
probably
) a live vs beta thing by some on the VRC Team (they can ofc comment themselves here if they want to) so don't quote me on this.