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Drilldown Choropleth - Drilldown Issue



I'm facing an issue with Drilldown Choropleth and can't seem to find an answer :


I'm trying to display 4 countys and all of their cities, like that :



As you can see, this is the same file with the same parameters.

It works just fine those arrows :


But when i click on a county to show cities from this specific county, i got a blank page


The only exemples i could find all were with outdated links (404), is there a link i need to create between my two TOPO JSON files ?

Here are the links to my TOPO JSON, if you want to check them out :
(counties are Départements & cities are Communes)

Super User
Super User

You need an actual data table in addition to the map files. Can you maybe post a sample of that data?

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