My first reaction was "That can't be right!"
But I had a Char that killed the Summer and Autumn just yesterday and stopped there, because I had to helpa a friend.
So I went straight to their boss room and.... it's summer and the vines allowed me to skip the hydra fight.
Then i tried to recreate it and reset the temple of seasons, fight the two Fae and ... what then? It didn't matter what I did. i couldn't get the skip to appear again.