This is probably a very low priority issue since it's due to incorrect setup in the first place. Just represents one extreme scenario.

Steps to replicate:

1. In web root project in visual studio, expand references node and remove all dynamic references
2. Add any project reference that would have been picked up by dynamic reference to web root project manually
   1. In the example below, foundation serialization project was added.
3. Build project

Error:

CollectFilesFrom_binDeployableAssemblies: Gather all files from Project items @(_binDeployableAssemblies). Adding: 1>...\RichardSzalay.Helix.Publishing.WebRoot.1.4.4\build\Helix.Publishing.Plugins\CollectFilesFromHelixModules.Additional.targets(36,9): error MSB4094: "..\..\Foundation\Serialization\code\xxx.Serialization.csproj;..\..\Foundation\Serialization\code\xxx.Serialization.csproj" is an invalid value for the "Module" parameter of the "ResolveModuleContentTargetPath" task. Multiple items cannot be passed into a parameter of type "Microsoft.Build.Framework.ITaskItem". [....csproj]

Thank you!