(Our.Umbraco.DocTypeGridEditor.Models.UnpublishedContent).Children is always null?

[mistyn8]

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umb 9.0.1 and dtge 9.0.0- rc001

having an issue only when udpating properties in a dtge in the backoffice Using the umbracoContextAccessor to get the current node

// umbraco node that is currently rendered
                    IPublishedContent currentPage = _umbracoContextAccessor.GetRequiredUmbracoContext().PublishedRequest.PublishedContent;
 DepartmentPastResultPage saleReport = currentPage.FirstChild<DepartmentPastResultPage>(x => x.SaleId == sale.SaleId);

hitting submit to update dtge property then results in error as currentPage has no children. currentPage at this point seems to be a Our.Umbraco.DocTypeGridEditor.Models.UnpublishedContent and not IPublishedContent/

https://github.com/skttl/umbraco-doc-type-grid-editor/blob/8830b2362bbd1d2666ee6caee4782e4e95c97c92/src/Our.Umbraco.DocTypeGridEditor/Models/UnpublishedContent.cs#L34

seems to not be implemented?

I've got around this presently by wrapping in

if (currentPage.GetType() == typeof(IPublishedContent))
                    {...}

the backoffice does render as expected, so I'm guessing this is a transient intermediary step?