I've noticed poorly programmed cut-extrude window.

In "blind" cut extrude window if you put in a letter and press tab it will ask to create a new variable. Click No. Then change to "Up to Vertex" for example. If you try to confirm it will ask again to create a variable. Even if you change back to "Blind" it will still ask to create a variable.
Wont even bother to post this to customer portal because reporting there takes 100 clicks.