Yes, I have submitted a ticket. They acknowledge that there is a bug:
Unfortunately the issue with the preview appears to be related to a known bug with ACF and the WordPress block editor. The same issue can happen when previewing fields in an already published post. This is something that we’re planning to fix up in a future release.
In either case, the custom fields should show up in the frontend once the post has been published.
But they don’t think this could be the cause of custom field data not showing up on the frontend after scheduled posts are published.
