By suggestion from NuGet/Home#7921 (comment)

By default, Microsoft.NET.NuGetOfflineCache.targets (imported by Microsoft.NET.Sdk.BeforeCommon.targets) will add an extra search path for nuget packages that is not controlled by the user nuget.config. It will add the sdk/NuGetFallbackFolder from your dotnet installation to the set of nuget search locations. This could potentially poison your nuget cache between repos, even if you've configured per-repo nuget caches.

https://github.com/dotnet/reproducible-builds/blob/main/docs/Reproducible-MSBuild/Techniques/DisableImplicitNuGetFallbackFolder.md

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