Hi, is there a known bug in the “override end of survey” option in the survey flow?

I’ve used it before so I know how to define it. I clicked on the “customize” option, I selected the message that I’d like to show, but when I hit “Save” I see that it ignored everything I had just defined (It also doesn’t show the little “v” next to “customize”). It’s like it closed the window without saving it.

Help please?