Bugfix: creating new doc type properties sort order doesn't count existing properties - puts it at top (+1) (#2523)

Bug 17457

umbraco/Umbraco-CMS#17457

Creating new doc type properties sort order doesn't count existing properties.

Looking at this it seems that the hardwork is done to workout the sort order and assign it to preset but it's not returned undefined was (probably as a dev placeholder that's gone unnoticed!).

Author: cheeseytoastie

src/packages/core/content-type/workspace/views/design/content-type-design-editor-properties.element.ts

@@ -193,7 +193,7 @@ export class UmbContentTypeDesignEditorPropertiesElement extends UmbLitElement {
 					}
 					preset.sortOrder = sortOrderInt;
 				}
-				return { data: { contentTypeUnique: this._ownerContentTypeUnique, preset: undefined } };
+				return { data: { contentTypeUnique: this._ownerContentTypeUnique, preset: preset } };
 			})
 			.observeRouteBuilder((routeBuilder) => {
 				this._newPropertyPath =