Compiling from markdown syntax

Hi,

I might be being really stupid, but I can’t for the life of me figure out how this is supposed to work, and it’s driving me nuts.

So, I am writing my novel with markdown syntax for emphasis. Now, I want to compile the standard manuscript. In the compile options, under transformations I tick “Convert markdown to bold and italics”, and “Convert italics to underline”.

Scrivener seems to ignore that second option, and I just end up with italics. I would have expected the italics to be converted to underlines.

Am I doing something wrong?