First, I re-ran the ZIP build. This doesn't bump the version number a second time (which is great), but it does fail with release draft creation.
Here's a message that I sent to Riad to check assumptions (Riad mentioned it was 👍, and this worked when we tried it):
Okay! I’ve been working on the release today.
I dug into the scripts a bit, and it looks like while build-plugin-zip does put new commits on top of the new (pending) Release Notes, it does not seem to handle tagging or updating the changelog following updates in the RC Release / Notes to reflect any changes during RC. So, my current hypothesis is to recreate these conditions: