Yes, that matches what I see. It’s not been a huge deal for me, as I will generally make a new toot with a hand-selected image announcing a new post (or more likely a series of posts, since I appear to be pretty wordy), and only a few people follow my blog directly.
If fediverse comments to the blog were captured somehow, I would probably use a different workflow, but that’s still under discussion in a couple places and it sounds like @matt is still thinking about a solution.