Sound Preferences Icon Missing for Sound Applet

It seems like there should be an icon in the rc menu for the sound applet:

What icons and theme do you use. If it’s not stock please contact the dev of that theme or icon set

I created them Custom Installers for Cursors, Icons, and Emerald Themes
It doesn't matter if it's those, Adwaita, or Ambiant MATE, the icon is missing in the RC menu itself.

Edit: See, here's the Radiant-MATE icons (I logged out and back in first):

Here's some screenshots of how it should look:

This is now fixed upstream in mate-media 1.18.2.