This Quick-Tip (more about them soon), is about a change that I noticed in Blogger's Post-editor a week or so ago - and I've just confirmed again that it's still happening now.
In short, the post-author is set to the first Google-account that saves a post - not the first one that Publishes it.
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Quick-tips
» Post author is now the first person to save a post, not the first to publish it