This quest(https://www.wowhead.com/quest=37858/stellagosa) have some missed data.
Fix:

Grail-Quests-retail.lua:

G[37858]='A:3000002 L658175 E21570 P:37856+37859' --change A by your key generation algo
G[37957]='L658175 A:90065 T:89978 P:37855 E21570 O:37858' -- 37858 is breadcrumb for 37957

Grail-NPCs-retail.lua:

G[3000002]={'630:49.28,16.49 A:89978'} --change key

Sorry for such submission, but for pull request I don't know how to add new NPCs without conflicting with your NPC AliasID generation algorithm...