What's going on with Pope Francis?

On March 12, Pope Francis went to the Jesuit Church of the Gesú in Rome for a Mass on the occasion of the 400^th anniversary of the canonizations of St. Ignatius Loyola and St. Francis Xavier. The pope preached at the Mass and concelebrated. He had earlier been scheduled to be the principal celebrant, but Fr. Arturo Sosa, S.J., Superior General of the Society of Jesus, for some reason, was the principal celebrant instead.
           
          Liturgical theology and law do not countenance that a bishop, let alone the diocesan bishop in his own diocese, concelebrate Mass with a priest as the principal celebrant (apart from a grave necessity, such as infirmity). This flows from the nature of the episcopal office: the bishop is the high priest in his diocese. He offers the sacrifice of the Mass for his people, while his priests, co-workers who serve the local Church under his authority, concelebrate with him.

 The Mass began with the usual entrance procession. Pope Francis was already seated in a chair near the altar. He wore no liturgical vestments, and thus gave no indication that he was either concelebrating or presiding. He preached without wearing the liturgical garments (mozetta, rochet, and stole) that are prescribed to be worn when the preacher is not the one celebrating the Mass. 

He concelebrated, extending his hand and saying the words of consecration, without wearing Mass vestments (alb, stole, and chasuble). This practice is strictly forbidden. In its 2004 Instruction Redemptionis Sacramentum, the Congregation for Divine Worship stated: “The abuse is reprobated whereby the sacred ministers celebrate Holy Mass or other rites without sacred vestments.”
 

More at The Catholic Thing, https://www.thecatholicthing.org/2022/03/22/papal-abuse-of-liturgical-law/

We Protestants are just happy when the pastor doesn't wear jeans with holes and athletic shoes.