[Rhino6] FileImportPlugIn.ReadFile results in empty document

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[Rhino6] FileImportPlugIn.Load() no longer adds a "Default" layer in the document, warning "Turning on current layer"

We’re busy porting our plug-ins to Rhino 6 and I just noticed that when a file is loaded through a FileImportPlugIn (of which we have many), the “Default” layer is no longer present in the document. In Rhino5 this used to be the case. Fortunately, this can be solved by adding such a layer prior to importing any geometry. Is there a reason for this change? One thing I noticed is that when no “Default” layer is present, that in at least one case I got a warning in Rhino after the file was loaded …