Catholics split with the Orthodox Church about a thousand years ago.
They were "protesting" the Orthodox not accepting their pope as supreme authority over them.
As well as many other un scriptural beliefs of Catholicism, as the Orthodox preferred to follow Christianity rather than Catholicism.
Which act by Catholics made them in essence the first Protestants.
And yet, if a Baptist church split over some point of doctrine, it would be condemned by Catholics and used as an example of the fallacy and weakness of sola Scriptura.
Catholics allow for themselves what they disallow for everyone else.
It’s called *hypocrisy*.
They also have SSPV which broke away from the traditional sect the Society of St. Pius X (SSPX) over liturgical issues, and also hold that many in the hierarchy of the Roman Catholic Church no longer adhere to the Catholic faith but instead profess a new, modernist, Conciliar religion. But SSPV priests regard the questions of the legitimacy of the present hierarchy and the possibility that the Holy See is unoccupied (sedevacantism) to be unresolved.