I am having the same problem with my scarecrow pet! I got it yesterday after the quest at lvl 58 and the timer went down but today when I logged back on it says
Necromantic Egg 1193045:45:24:35 :( What's going on :(
ok i dont know for sure but i think someone has planted a bug in the pet egg programing thus any egg can be efected like a jade oni an otherworldy egg a scarecrow egg im having a hard time with my lvl 58 quest so once i finish ill tell youif my egg is having the same prob. or maybe its a drop and quest prob. idk but ill make a online program and see if this prob occors if i attempt to duplicare the circumstances.
I once had that problim with the never ending hatch time but an easy soulution is to teliport somewere then it should be in your bag ready to be equipt.