Yesterday I’ve done the [Stable Update] 2019-07-17 and today I also done the update about manjaro-xfce-gtk3-settings.
My system theme is Vertex Maia Dark, and as any other theme has always been applied eveerywhere, also in the logout panel of XFCE (the one which is accessible from the Whisker Menu).
Since yesterday such panel fallback to a Gnome Theme:
Doesn’t change also if I switch to any other theme. Why?