Unexpected / unhandled error when opening Trabant car object

I have problem with opening an object in newer OpenBVE, RouteViewer and ObjectViewer releases. The object is the old East German car, the Trabant, which is available from here:

https://objektumtar.wordpress.com/2016/02/13/trabant

The errors I get are:

Error - An unexpected error occured whilst attempting to load the following object: C:\Trabant\Trabant.b3d
Error - Plugin Object.CsvB3d.dll returned unsuccessfully at LoadObject
Error - No plugin found that is capable of loading object C:\Trabant\Trabant.b3d
Critical - Unhandled error (Az objektumhivatkozás nincs beállítva semmilyen objektumpéldányra.) encountered while processing the file C:\Trabant\Trabant.b3d.

The Hungarian part says the object link is not set to an instance of the object.

I looked through the object but couldn't find anything obviously wrong. It does have a lot of complicated Vertex/Face structures, though. It did work in previous OpenBVE versions and still does up to v1.7.0.3, but not on newer releases. I guess there may be a bug somewhere.

Thanks, 1.7.2.3 should be live any minute
(Was misinterpreting something as an extra normal, and this was serious enough to push a fixed build)

That was very quick, thank you!