[Manozco]

You can fix it by creating the file `/usr/local/bin/xdg-open` and putting this inside:

    #!/usr/bin/env bash

    if [[ "${1:-}" = slack://\* ]]; then
        exec /usr/lib/slack/slack --enable-crashpad "$1"
    fi

    exec /usr/bin/xdg-open "$@"

Granted it's not perfect, but at least it fixes the issue on KDE