First Relax...Deep Breath...and Congratulations.
At day 55 the baby will survive. I assume by cutting you didn't break the egg yolk just the white egg covering?
Snake eggs have a natural anti-mold, anti-fungal coating so that is the reason why it didn't get disgusting like the other 2.
I would just leave the whole lot in the incubator and wait (you can also cut away the bad egg parts that aren't in contact with the good egg...which will help cut down on the smell)
But either way in a few more days you should have a nice new baby.
BTW...it can't be a maggot as that would require flies in your incubator![]()