This quest got stuck for me at the stage where we bring the egg to the Emerald Oathstone in Ohn’ahran Plains. THE EGG WOULD NOT HATCH!
I didn’t think much of the hazy green edge around my screen, reminiscent of the haze that borders the screen around the Emerald Nightmare area in a previous expansion because, well, the egg was to become an emerald whelp and I was at the Emerald Shrine.
I tried flying to the top of the shrine, approaching on foot and on dragon, abandoning the quest & starting over, waiting for the daily reset, turning off all my add-ons, logging out … nothing worked.
Frustrated, I decided to just continue my campaign, which happened to be on that island, (but did not abandon the hatchling quest again.)
When I finished the campaign there, I noticed that the green haze had cleared when I approached the shrine and now I had the option of hatching the egg! ((Yeah!)). I didn’t even realize that I was in a phased aspect of my campaign, but apparently I was. It caused this step of my hatchling quest to bug out.
So, if your egg doesn’t hatch when you approach the Emerald Oathstone, (and especially if you have that green haze around your screen), check to see if you are in a phased aspect of any of your ongoing quests, particularly the campaign line that ends with the achievement, “The Dreamer” - which is a requirement of the meta achievement, “Friend of the Dragon Isles”