Suggestion: show all details/summary blocks open on composer preview

The post composer realtime preview is one of the best things about Discourse, but one remaining annoyance is when editing a [details] block: the content of the block is always closed on the preview while editing it.

It’s possible to preview it by manually opening the block on the preview, but as soon as a character on the post is changed, the block is closed again, loosing the realtime preview of its content.

Is there any downside to have all [details] blocks open on the post preview by default?