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Appsettings build error with VS 2026 and v3.0 #181

Description

@YaakovN

F# console application uses App.config.
Accesses via FSharp.Configuration.AppSettings Type Provider, v3.0.0
When building with Visual Studio 2026 (18.1.0), I now get
"FS0039: ... does not define the field, constructor, member 'XYZ'.
for every config property, including ConnectionStrings.
When either reverting to nuget package v2.0.0 or building with VS 2022, it builds as expected.

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