Drush Problem (13.3): if [ -z "$COMPOSER_RUNTIME_BIN_DIR" ]; then # This branch is for the development of Drush itself.

Problem:

#drush st

if [ -z "$COMPOSER_RUNTIME_BIN_DIR" ]; then
  # This branch is for the development of Drush itself.
  # @see https://stackoverflow.com/questions/4774054
  SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
  DRUSH_PHP="$SCRIPTPATH/drush.php"
else
  DRUSH_PHP="$COMPOSER_RUNTIME_BIN_DIR/drush.php"
fi

parse_commandline()
{
        while test $# -gt 0
        do
                _key="$1"
                case "$_key" in
                        --xdebug)
                                DRUSH_ALLOW_XDEBUG=1
                                return
                                ;;
                esac
                shift
        done
}

parse_commandline "$@"

if [ "$DRUSH_ALLOW_XDEBUG" != 1 ]
then
  export XDEBUG_MODE=off
fi

"$DRUSH_PHP" "$@"

Solution (tmp):

Downgrade to Drush 13.2