Disconnect after Zarokh - all loot lost

I was just running Trial of the Sekhemas, got disconnected multiple times nut could rejoin and continued from where I was kicked out.
Unfortunately the last disconnect happened after killing Zarokh but before using all the earned keys to open chests. Now after reconnecting, the instance is gone and I can only open a new one with another Djinn Barja.

There really should be security built in to prevent that from happening.