ref DC does not report all dc if test.tj_dfesttype_dft is not filled

This query works by isolating the left join at the end

SELECT
  dis_identifiant AS DC,
  dis_date_creation,
  dis_date_suppression,
  dif_dis_identifiant AS DF,
  dis_commentaires,
  dif_ouv_identifiant,
  ouv_libelle,
  dif_code AS DF_code,
  dic_code AS DC_code,
  dif_localisation,
  dif_orientation,
  tdf_libelle AS type_DF,
  tdc_libelle AS type_DC,
  sta_code
FROM
  test.tg_dispositif_dis
JOIN test.t_dispositifcomptage_dic ON
  dic_dis_identifiant = dis_identifiant
JOIN test.t_dispositiffranchissement_dif ON
  dif_dis_identifiant = dic_dif_identifiant
JOIN test.t_ouvrage_ouv ON
  dif_ouv_identifiant = ouv_identifiant
JOIN test.t_station_sta ON
  ouv_sta_code = sta_code
JOIN ref.tr_typedc_tdc ON
  dic_tdc_code = tdc_code
LEFT JOIN (
SELECT * FROM  test.tj_dfesttype_dft 
JOIN ref.tr_typedf_tdf ON
  tdf_code = dft_tdf_code

WHERE
  dft_rang = 1) sub ON
  dif_dis_identifiant = dft_df_identifiant
ORDER BY
  dis_identifiant;