may have something to do with the Sabbatine Privilege.
The name Sabbatine Privilege is derived from the apocryphal Bull “Sacratissimo uti culmine” of John XXII, 3 March, 1322. In this Bull the pope is made to declare that the Mother of God appeared to him, and most urgently recommended to him the Carmelite Order and its confratres and consorores. The Blessed Virgin asked that John, as Christ’s representative on earth, should ratify the indulgences which He had already granted in heaven (a plenary indulgence for the members of the Carmelite Order and a partial indulgence, remitting the third part of the temporal punishment due to their sins, for the members of the confraternity); she herself would graciously descend on the Saturday (Sabbath after their death and liberate and conduct to heaven all who were in purgatory. Then follow the conditions which the confratres and consorores must fulfill. At the end of the Bull the pope declares:
Istam ergo sanctam Indulgentiam accepto, roboro et in terris confirmo, sicut, propter merita Virginis Matris, gratiose Jesus Christus concessit in coelis
(This holy indulgence I therefore accept; I confirm and ratify it on earth, just as Jesus Christ has graciously granted it in heaven on account of the merits of the Virgin Mother).
Our first information of this Bull is derived from a work of the Carmelite Balduinus Leersius (“Collectaneum exemplorum et miraculorum” in “Bibliotheca Carmelit.”, I, Orléans, 1752, p. 210), who died in 1483. The authenticity of the Bull was keenly contested especially in the seventeenth century, but was vigorously defended by the Carmelites. The chief opponents of its authenticity were Joannes Launoy and the Bollandist, Daniel Papebroch, both of whom published works against it. Today it is universally regarded by scholars as inauthentic, even the “Monumenta histor. Carmel.” of the Carmelite B. Zimmerman (I, Lérins, 1907, pp. 356-63) joining in rejecting it.