Listpicker elements not showed on first pick

MIT App Inventor Help
10

Here is an example of how to show breadcrumbs for a nested List Picker.
The base table is pre-loaded at Screen Initialize time, so I was able to load at before Selection time ...
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blocks
blocks748×1905 131 KB

Capture
Capture2 Docs.csv (3.5 KB) DocumenterV4.aia (5.7 KB)
global Docs
global Selection
global Viewed
last
Load_List_Picker
Load_List_Picker748×308 28.4 KB

pop_Viewed
when Screen1 BackPressed
when File1 GotText
when File1 GotText695×268 20.1 KB

when ListPicker1 AfterPicking
push_viewed
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All blocks:
blocks
blocks748×1905 131 KB

None of my screens will load once I open the builder
What I did in the project was not saved
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