Bug on Mime installing XFCE4 from KDE

Hi, I installed EndevourOS KDE from scratch. Afterwards, I installed xfce4 using Pacman. Most things work fine but mime type seems not working. I installed github-desktop-bin from AUR and by clicking on “Sign into github” the roller rotates but the browser is not opening. I anhe a similar installation using Manajaro and github-desktop opens Firefox correctly.

I think that during the installation of XFCE environment something goes wrong.

xdg-mime query default x-scheme-handler/https

returns

/usr/bin/xdg-mime: line 1430: [: : integer expression expected
xfce4-web-browser.desktop
cat /etc/xdg/mimeapps.list | grep x-scheme-handler/http
cat: /etc/xdg/mimeapps.list: No such file or directory
cat ~/.config/mimeapps.list | grep x-scheme-handler/http
x-scheme-handler/http=xfce4-web-browser.desktop
x-scheme-handler/https=xfce4-web-browser.desktop
x-scheme-handler/http=xfce4-web-browser.desktop;
x-scheme-handler/https=xfce4-web-browser.desktop;
locate xfce4-web-browser.desktop
/usr/share/applications/xfce4-web-browser.desktop
at /usr/share/applications/xfce4-web-browser.desktop
[Desktop Entry]
Version=1.0
Type=Application
Exec=exo-open --launch WebBrowser %u
Icon=org.xfce.webbrowser
StartupNotify=true
Terminal=false
Categories=Network;X-XFCE;X-Xfce-Toplevel;
OnlyShowIn=XFCE;
X-XFCE-MimeType=x-scheme-handler/http;x-scheme-handler/https;
X-AppStream-Ignore=True
Name=Web Browser
Name[ar]=متصفّح وِب
Name[ast]=Restolador web
Name[be]=Вэб-браўзер
Name[be@tarask]=Гартач сеціва
Name[bg]=  Уеб четец
Name[bn]=ওয়েব ব্রাউজার
Name[ca]=Navegador web
Name[cs]=Webový prohlížeč
Name[da]=Webbrowser
Name[de]=Internetnavigator
**(continue)**
exo-open --launch WebBrowser

opens a new instances of Firefox

echo $BROWSER
firefox
DBUS_SESSION_BUS_ADDRESS="autolaunch:" firefox

executes a new instance of Firefox

and

xdg-desktop-portal-gtk

is installed.

Any ideas? Thanks in advance