Problem getting Tag List from Firebase inner nodes

Hi guys,
I’m struglin with it for a couple weeks and now I’ve decided to create a test project and ask for help.
The thing is, my app analyses the performance of a worker into a week sprint, to do so the app first get the Tag List of the workers, this first one is working and then, for each worker it gets the Tag List of a week (e.g. from 3 to 8) and here’s the issue, it fails to get this second Tag List.
I’ll post the prints of the blocks and the Firebase structure.