Thanks for fixing this! I also spent the last 2+ hours trying to figure out what went wrong with my rebuild. All is good now!
A meta-observation: when researching the issue in this forum, the default “Relevance” sorting of forum search results worked against me. The error logs on which I searched were exactly the same as here, but this recent topic only appeared many pages down in the results list (probably due to its recency). Hence, I didn’t find this topic until I haphazardly opened the Meta front page where it was trending. I guess this is a note to self/others to also check the front page or most recent results while trying to research a future rebuild issue.