Some issue with postMessage() in Safari v17.0

I have a published widget which is not working in Safari only for latest version (Safari v17.0).
The widget is working other browsers and also Figma desktop app.
Based on my assessment there seems to be an issue in postMessage(). The image below shows the recent change in their log.

Is anybody else facing this issue? and also how can I go about debugging this issue? as of now thinking of publishing a version with loggers added, to identify the cause.