What changes in build sequence or assemblies resolution after I convert project from packages.config to PackageReference format?

[voroninp]

I've a legacy application which I need to upgrade. It targets .NET 4.6.2 for now.

After I migrated projects ti PackageReference format, I started getting errors from SGEN when building for Release configuration:

SGEN : error : An attempt was made to load an assembly with an incorrect format: .nuget\packages\syste
m.text.encoding.codepages\4.5.0\ref\netstandard2.0\System.Text.Encoding.CodePages.dll.

Can anyone explain me what changes in build system or dependencies resolution algorithm, so SGEN touches more assemblies than it did before?