Thank you for your detailed post.
This omission has been previously reported, and our Development and Software Quality Assurance (Testing) departments are aware of it. When more information becomes available, I'll let you know.
For what it's worth, I believe this problem has been around ever since the tab panels were introduced (FM 9?).
I generate a DDR every few weeks or so and have gotten into the habit of not relying on the "Layouts that use this script" section. I resort to using my browser's Find function (Safari's is great) to see exactly where a specific script is used. It's a pain, but it works. I'd REALLY like to be able to rely on the DDR data itself.