Comment 4 for bug 1892146

Ok, so the issue with the launcher is that your favourite for Chromium is 'chromium-browser.desktop', whereas it should be 'chromium_chromium.desktop'.

If you have the chromium-browser deb package installed, running /usr/bin/chromium-browser (just once) should translate the desktop file name. If not, you can modify its value by hand with this command:

    gsettings set org.gnome.shell favorite-apps "['thunderbird.desktop', 'libreoffice-writer.desktop', 'libreoffice-calc.desktop', 'org.gnome.Nautilus.desktop', 'chromium_chromium.desktop', 'org.gnome.Screenshot.desktop', 'org.gnome.Calculator.desktop']"

Please let us know if that fixes the problem for you.