New Confluence Cloud REST API Problems

Is anyone else experiencing difference/problems with the Confluence Cloud Rest API with the change over to the New Confluence?

I am prepared to adapt to the change but looking for pointers if anyone has been through them. I am happy to share my journey as well.

With the old Editor experience I could create/edit a Confluence page through the rest API.

With the New Cofluence editor I am struggling with encoding problems when I start with body=storage from a “new” confluence editor page and then try to render it into a new page. This worked robustly in the older page.

If I manually get around the encoding problem the newly created Confluence page reverts to the Old Editor.