What about this (code from Dejan's answer)?

var linkRepository = ServiceLocator.Current.GetInstance<ContentSoftLinkRepository>();
             
var blockLink = (currentBlock as IContent).ContentLink;
 
var referencingContentLinks = linkRepository.Load(blockLink, true)
                                            .Where(link =>
                                                    link.SoftLinkType == ReferenceType.PageLinkReference &&
                                                    !ContentReference.IsNullOrEmpty(link.OwnerContentLink))
                                            .Select(link => link.OwnerContentLink)
                                            .ToList();