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Not the first time something like this happened. Shortly after I became an Insider, I upgraded a Win7-Home & it was "given" Win10-Pro.
Here’s a quick public service announcement, if you are running Windows 10 S and are in the Insider program, be aware that when you are shipped a new build, it will likely move you to Windows 10 Pro.
I’m not exactly sure when this change happened but I was able to confirm the issue by taking a Surface Pro running Windows 10 S, enrolling it in the Fast ring of the Insider program and updating to the latest build. After doing so, my machine was running Windows 10 Pro, instead of Windows 10 S...
Read more: PSA: Windows 10 S Insiders Receiving Windows 10 Pro Instead of S - Thurrott.com
Not the first time something like this happened. Shortly after I became an Insider, I upgraded a Win7-Home & it was "given" Win10-Pro.
Those that got the upgrade from 10 S to 10 Pro should be happy. :) Like you said, Bonus. You should be able to go back, with a little work, if you have to. And still keep your DL for Pro.