I had the same problem with one corn snake. I hope your corn gets better

My corn died because after the tail tip fell off, it went to necrosis that just kept spreading even though I desinfected her tail twice a day and she had antibiotics. I even cleaned her cage every day, and changed her bedding (paper towel).
In the end her tail fell off just few centimeters after her cloak area and when I was just about to let her go, she passed away herself.

This happened about 1,5 years ago. I check all my snakes carefully after every shed so I don't understand how she got that stuck shed without me noticing anything before it was too late :/