Yes, there was an error in the original posts! Thanks to John Lowry for spotting it and bringing it to my attention. It has been fixed and is included here for your convenience.
The moral of the story is, “Don’t use a new software feature until you’ve thoroughly tested it.”
A secondary lesson might be, “Don’t be surprised at the methods software developers will use to introduce their software to new users!”
Sorry for any inconvenience or confusion!
Thanks, John Lowry and Walter!