PBI Destktop changes M script during upload csv from Azure Datalake

I have a file from azure datalake that is uploaded in PBI.

PBI automatically creates various scripts, li,ke:

let
Source = DataLake.Contents("adl://tenant.azuredatalakestore.net/Folder/File.csv"),
Navigation1 = Source{0}[Content],
in
Navigation1

However, when refreshing in PBI desktop, the script is transferred to:

let
Source = DataLake.Contents("adl://tenant.azuredatalakestore.net/Folder/File.csv"),
Navigation1 = Source{0}[Content],
#"Imported CSV" = Csv.Document(Navigation1,[Delimiter=":", Columns=19, Encoding=1252, QuoteStyle=QuoteStyle.None]),
#"Changed Type" = Table.TransformColumnTypes(#"Imported CSV",{{"Column1", type text}, {"Column2", Int64.Type})
in
#"Changed Type"

And this is wrong, it should not change.

How to avoid this?

Thanks,

Johan