OBD won't display properly drawings created in AECOsim v8i

We received dozen of drawings from the contractor, they were created in AECOsim V8i. When I open them in ODB UP8 or Microstation UP15 some elements of the drawing are missing, see highlighted section on the last screenshot. All levels and view attributes settings are the same in both programs. This is only one example but I experience this problem ever since I upgraded to Connect Edition over two years ago. I still keep v8i on my machine only because of this.

Personally it's not a big issue for me since I have both applications installed but my client is using Bentley View to review CAD files and always complain that CAD doesn't match PDF. Is there anything to make Connect Edition programs more compatible with old drawings? 

Unfortunately I am not able to share DGN files as this drawing is made of several models, each 10-20mb big.

Below is screenshot from AECOsim v8i

This one is from OBD UP8 

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