Missing glyphs with urxvt-unicode

I cannot display some special characters in my urxvt-unicode terminal emulator on Arch Linux.

My setup:

$ cat ~/.Xresources
URxvt.font: xft:Meslo LG S DZ for Powerline:style=RegularForPowerline:size=9, 
        xft:Pomodoro, 
        xft:FontAwesome, 
        xft:icomoon, 
        xft:octicons

URxvt.scrollBar: false

#include ".Xresources.d/Xresources.dark"


$ locale
LANG=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8

All the fonts are installed and work in other applications (for example my lemonbar), only with urxvt I get those typical fallback empty boxes. I also tried different fonts, font sizes and font letterspace. Has someone any other hint for me? In particular I need some special characters included in the fallback fonts defined in my .Xresources, for example the Linux logo U+F612.

URxvt.font: xft:Meslo LG S DZ for Powerline:style=RegularForPowerline:size=9, 
            xft:Pomodoro:size=6, 
            xft:FontAwesome:size=6, 
            xft:icomoon:size=6, 
            xft:octicons:size=6