You used the Wisdom Illithid Check on Fezzerk Goblin who is making fun with the deepgnome on the Windmill.
When using Illithid Option you will get allways get the -1 as in Patch 7.
Before Patch 7 it was somthing else.
Seems it has not been decided how to finally visually design a allways winning illithid check on the Dice Popup.
Why it reads failed is besides me.

Shouldnt.