Today, Jan. 4, 2019, Director ad interim of the Holy See Press Office, Alessandro Gisotti, issued the following statement to journalists, in response to some press inquiries. Here is a Zenit working translation of the Italian text:
response to the questions of some journalists, the “interim” Director of the Holy See Press Office,  Alessandro Gisotti, said:
“Bishop [Gustavo Óscar]  Zanchetta was not removed from the Diocese of Oran, [Argentina]. It was he to step down.
The reason for his resignation is linked to his difficulties in managing diocesan clergy and very tense relations with the priests of the diocese. At the time of his resignation, there were accusations

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