Este es mi código para registrar notificaciones interactivas para ios8:

+ (void)registerInteractiveNotifications
{
    UIMutableUserNotificationCategory *corideInviteCategory = [self corideInviteCategory];
    UIMutableUserNotificationCategory *riderInviteCategory = [self riderInviteCategory];

    NSSet *categories = [NSSet setWithObjects:corideInviteCategory, riderInviteCategory, nil];
    UIUserNotificationType types = (UIUserNotificationTypeAlert|
                                    UIUserNotificationTypeSound|
                                    UIUserNotificationTypeBadge);

    UIUserNotificationSettings *settings;
    settings = [UIUserNotificationSettings settingsForTypes:types
                                                 categories:categories];

    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
}

+ (UIMutableUserNotificationCategory *)riderInviteCategory
{
    UIMutableUserNotificationAction *accept;
    accept = [[UIMutableUserNotificationAction alloc] init];
    [accept setActivationMode:UIUserNotificationActivationModeForeground];
    [accept setTitle:@"Accept"];
    [accept setIdentifier:RiderInviteAccept];
    [accept setDestructive:NO];
    [accept setAuthenticationRequired:NO];

    UIMutableUserNotificationAction *decline;
    decline = [[UIMutableUserNotificationAction alloc] init];
    [decline setActivationMode:UIUserNotificationActivationModeForeground];
    [decline setTitle:@"Decline"];
    [decline setIdentifier:RiderInviteDecline];
    [decline setDestructive:YES];
    [decline setAuthenticationRequired:NO];

    UIMutableUserNotificationCategory *actionCategory;
    actionCategory = [[UIMutableUserNotificationCategory alloc] init];
    [actionCategory setIdentifier:RiderInviteCategory];
    [actionCategory setActions:@[decline, accept]
                    forContext:UIUserNotificationActionContextDefault];
    [actionCategory setActions:@[decline, accept] forContext:UIUserNotificationActionContextMinimal];

    return actionCategory;
}

+ (UIMutableUserNotificationCategory *)corideInviteCategory
{
    UIMutableUserNotificationAction *accept;
    accept = [[UIMutableUserNotificationAction alloc] init];
    [accept setActivationMode:UIUserNotificationActivationModeForeground];
    [accept setTitle:@"Accept"];
    [accept setIdentifier:CorideInviteAccept];
    [accept setDestructive:NO];
    [accept setAuthenticationRequired:NO];

    UIMutableUserNotificationAction *decline;
    decline = [[UIMutableUserNotificationAction alloc] init];
    [decline setActivationMode:UIUserNotificationActivationModeForeground];
    [decline setTitle:@"Decline"];
    [decline setIdentifier:CorideInviteDecline];
    [decline setDestructive:YES];
    [decline setAuthenticationRequired:NO];

    UIMutableUserNotificationCategory *actionCategory;
    actionCategory = [[UIMutableUserNotificationCategory alloc] init];
    [actionCategory setIdentifier:CorideInviteCategory];
    [actionCategory setActions:@[decline, accept]
                    forContext:UIUserNotificationActionContextDefault];
    [actionCategory setActions:@[decline, accept] forContext:UIUserNotificationActionContextMinimal];

    return actionCategory;
}

Lo que sucede es: cuando elimino la aplicación y la instalo nuevamente, aparecen los 2 botones de acción (cuando abro el banner de notificación o deslizo hacia la izquierda en el centro de notificaciones). Pero después de un tiempo (no estoy seguro de qué lo causó), dejan de aparecer aunque sigo enviando la misma notificación. Este es el contenido de mi notificación:

{"aps":{"alert":"test","category":"coride_invite"},"journey_id":100}

¿Alguien puede arrojar algo de luz por favor? Gracias