Comparing CBT.DotNetFx-net471.1.0.2 and CBT.DotNetFx-net472.1.0.1 there is an extra directory level to access Facades in 472. In 471 the directory for System.Collections.dll is build\net471\Facades\System.Collections.dll in 472 it is build\net472\Facades\Facades\System.Collections.dll
Comparing CBT.DotNetFx-net471.1.0.2 and CBT.DotNetFx-net472.1.0.1 there is an extra directory level to access Facades in 472. In 471 the directory for System.Collections.dll is build\net471\Facades\System.Collections.dll in 472 it is build\net472\Facades\Facades\System.Collections.dll
I have traced the problem down to https://github.com/CommonBuildToolset/CBT.Modules/commit/b7e32a9f09328d5c03fbb6d3cf05e2a0937d5800 When we migrated from .nuproj to .csproj the extra Facades directory was added to all the CBT.DotNetFx output nupkg.