Issue While Creating Custom Data fieled in content fragment aem cloud

Hi All, i have followed this article to create a custom data field but its not working in aem cloud lastest sdk .

https://blogs.perficient.com/2020/10/20/adding-a-color-picker-to-the-aem-content-fragment-model-editor/

https://github.com/AdobeDocs/experience-manager-64.en/blob/main/help/sites-developing/customizing-content-fragment-model-data-types.md

issue i am facing -- > properties is always getting blank