If you publish the model as an i-model *.i.dgn from AECOsim it will write the materials assignments from the associated Family or Part to the element and this will be embedded in the i-model. In your case you have opened directly DGN file with OPM. My guess is that your DGN file from AECOsim contain the Part or Family definition which references material assignments for visualization. In OPM you don't have those material palettes meaning that model representation is limited to the 'model' symbology - shows only colour and not a material.
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