Just before the maintenance on Tuesday I had collected the 9 eggs in "Lost Easter Eggs" island and completed that quest. The main quest on the island however did not complete. After maintenance I was stuck as there were no more eggs and the quest to collect them was gone.
The adventure got canceled/expired and now I'm just stuck in the chain as I need to do "Lost Easter Eggs" but I don't have it anymore.
Posting the screenshot here as a warning not to complete half an island just before maintenance...