I have this issue using next.js too. It is stuck on ‘loading discussion’ for the first load (before topic creaed). If i refresh, the comments/start discussion shows - so it creates the topic fine for me, but doesn’t update the loading state (have to refresh to show updated state with comment box).
It’d be good if there was a callback or something to let you know the topic is created as it’s not ideal to have to refresh the page. I don’t know if that is possible with an iframe