The East is vastly different from the West.
The rôle of the papacy is perceived differently by Eastern Catholics, especially those churches of byzantine ritual. They confess communion with Rome but do not hold themselves to be "under" Rome.
If Rome becomes objectionable to them, the reaction is not to find an invalidating fault in the person claiming papal office, as does sedevacantism. The general reaction to what would be a perceived objectionable papacy will be a return to Orthodoxy. Case in point, the criminal behaviour of 19th-century U.S. Roman Catholic bishops, especially Archbishop John Ireland if St. Paul, and the failure of Rome to rectify the matter--in fact, only worsen the situation--led tens-of-thousands of Eastern Catholics in the USA back to Orthodoxy in the period 1880 to 1930.