Restore trashed posts with comments

When a WordPress post is trashed, all the comments are trashed as well. I would expect the “undo” button to restore both the post and the comments. However, all the comments seem to just disappear : they’re not moved into the Dashboard->Comments->Trashed folder, and they are not restored with the original post.

Is there a way to get them back ?

Thank you in advance.

Once you restore the posts that are trashed you can try running the comment-fix.php script to reset the comments to appear and show the correct count. If it has been over thirty days in the trash the comments are gone for good, sorry.