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C3D-0468 · Clone 22X17 layout from source into 260904 error

WblockClone the 22X17 paperspace BTR from SS_BLOCK_22X17.dwg and register it as layout 22X17 (with the title block already on it).

C# payload

string path=@"C:\Users\sanja\OneDrive\_SurveyDisco\SS_BLOCK_22X17.dwg";
using(var src=new Database(false,true)){
    src.ReadDwgFile(path,System.IO.FileShare.Read,true,null);
    ObjectId srcLayoutId=ObjectId.Null, srcBtrId=ObjectId.Null;
    using(var stx=src.TransactionManager.StartTransaction()){
        var lm=(DBDictionary)stx.GetObject(src.LayoutDictionaryId,OpenMode.ForRead);
        foreach(System.Collections.DictionaryEntry de in lm){ if(((string)de.Key)=="22X17"){ srcLayoutId=(ObjectId)de.Value; var lay=(Layout)stx.GetObject(srcLayoutId,OpenMode.ForRead); srcBtrId=lay.BlockTableRecordId; } }
        stx.Commit();
    }
    if(srcBtrId.IsNull){ Log("no 22X17 layout in source"); return; }
    // wblock-clone the paperspace BTR into this db's block table
    var ids=new ObjectIdCollection(); ids.Add(srcBtrId);
    var map=new IdMapping();
    Db.WblockCloneObjects(ids, Db.BlockTableId, map, DuplicateRecordCloning.Replace, false);
    // find the cloned BTR
    ObjectId newBtr=map[srcBtrId].Value;
    Log("cloned paperspace BTR null? "+newBtr.IsNull);
    // create a Layout dict entry pointing at it, named 22X17
    var lmgr=LayoutManager.Current;
    string dest="22X17"; int i=2; while(!lmgr.GetLayoutId(dest).IsNull){ dest="22X17-"+i; i++; }
    // Create a fresh layout then swap its BTR? Instead: build Layout object
    var layoutDict=(DBDictionary)Tx.GetObject(Db.LayoutDictionaryId,OpenMode.ForWrite);
    var newLayout=new Layout();
    newLayout.LayoutName=dest;
    var newLayId=layoutDict.SetAt(dest, newLayout);
    Tx.AddNewlyCreatedDBObject(newLayout,true);
    newLayout.AddToLayoutDictionary(Db, newBtr);
    var btr=(BlockTableRecord)Tx.GetObject(newBtr,OpenMode.ForWrite);
    btr.LayoutId=newLayId;
    Log("created layout "+dest);
    lmgr.CurrentLayout=dest;
}
Ed.Regen();

Result

cloned paperspace BTR null? False
created layout 22X17