Apologies for the spam, whatever caused this issue must have been temporary.
We tested multiple times on our instance and it was repeatable on the day I reported it, but now we are no longer able to replicate this either on the demo instance or on our original instance.
My best guess is there was some form of caching or state persistence that we were experiencing on that day.
Thank you for following up with this, I am moving it to General as it is clearly a non-issue.