I feel like I am missing something regards to the symbology of scene layer packages. I am unable to change the symbology of created 3D object scene layer using unique values in Pro and Portal. The reason being is that all of the unique values for the building type field have been lost. Yet retained in the pop-up.
I have created a 3D multipatch layer of buildings, and we want to visualise the building types using symbolise by unique values. If I set the symbology to the 3D multipatch layer, then, create the scene layer package using the Create 3D Object Scene Layer Content tool. The symbology is retained accurately however, if I want to change the symbology later, the attribution is lost.
I believe I read that a 3D Object Scene Layer can retain a feature layer to allow for editing etc. Is there some step I am missing to retain attribution in order to change the symbology later?
First Image shows Original Symbology set

Second image when we try to change the symbology
