Cannot connect to instance. That subarea no longer exists.

I ported out of a map to sell an item. I still had 4 portals remaining, when I clicked one of them, all the portals disappeared, and I got the message "Cannot connect to instance. That subarea no longer exists."

This is really painful with the choke points and semi-hc maps.

Though, now that I am here, let me say that the choke points and semi-hc maps are not a good (for myself I even say bad) gaming experience for casual players like me, even without the bugs like this.

Retried the map, did not have high hopes as all the traits (boss, corruption, rituals, breach) was removed. However, simply playing the map I got kicked back to the login screen with "Unexpected disconnection occurred", and when logging back, I did no longer have the portals.