Version 2.0.2 of ui-framework-javascript introduced an issue. Works on 2.0.1.

The event?.data?.state?.formFields is {} during 'init' (event.data.action === "init")
From the formFields an id is accessed to fetch the requested form, when the id is undefined it cases the form rules not to load.
 
Solution: * Load the formId from the parent window URL if the formId is undefined