we have been utilising the new microstation feature "named presentation" https://docs.bentley.com/LiveContent/web/OpenPlant%20Modeler%20Help-v9/en/NamedPresentation.html
at the moment, when an element has a named presentation applied, itwin only syncrhonizes the plan named presentation element and not the 3D element.
two options
itwin to have a named presentation option in its view attributes to turn it on or off similar to microstation view attributes
itwin completely ignores any named presentation and ensures that it only shows 3D elements that has named presentation applied.