The purpose is simple. Having two repeating groups, one nested to another get the data from Option Sets. Second, nested group is getting data from attribute, which inhereting data from Option set. And the source to retrieve data is not shown in the list. I double check manual and bubble videos.
Here is the video: Videos | Library | Loom - 12 April 2025 | Loom
I don’t think there’s a bug, I think you didn’t set correctly your data source
Should be Current cell Dashboard pagetab’s chart (or charts 2) as your want to reference the related OS dashboard attributes no?