Civil 3D 2018 to ACA 2013

We have started to get drawings from Civil consultants in the 2018 file format. Thanks to our recent move to the AEC Collection, we now have access to AutoCAD® Civil 3D®. I have no idea how to use that program, beyond the AutoCAD basics, but I installed the 2018 version of it in the hope that I would be able to export the received drawing to “vanilla” AutoCAD®. Similar to AutoCAD® Architecture and AutoCAD® MEP, you can go to the Application Menu > Export > Export Civil 3D Drawing to export a drawing. There is a dialog, where you can choose between AutoCAD DWG and Microstation® DGN, and, for DWG export, the Export Settings allow you to select a file format, such as 2013.

I did all of that, and Civil 3D did its thing, and drawings were generated. (I got more than one because I left the Include sheets toggle checked, so a drawing for each layout was also generated.) I fired up AutoCAD Architecture 2016 and opened the exported “Model” file, only to be greeted by this…
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