Hi there,
I’ve tested this three times just to make sure that it wasn’t a fluke. The first time rift that you encounter in the Precipice after fighting the Idol of Loathing, but when you go through the first time rift to the Ancient Cavern, if you attempt to zone back through the portal beside you to the Ruined Era the game will crash on the loading screen.
I did a quick search and don’t think this bug has been reported yet but if so I apologize.
Thanks,
Zallik