[Python] Problem while displaying Choropleth map for UK using Altair

I am downloading dataset from two different sources for UK areas. And I am using Altair code to display a Choropleth Map. But this what I get for both datasets using the following code:

_map = alt.Chart(geo_uk, title='UK Map').mark_geoshape().encode().properties(width=500,height=300);


Link to used data source (GeoJson file)

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