I recall seeing a similar issue some time in the past where any time you assigned an active profile to a horizontal, it would create a new 3D model. It was creating a new 3D model because it was writing that geometry as a 3D element since it now had an active profile. This could be something to do with the geometry being in a reference file and it writes a new model in the active file because that is the file you are working in. I don't know if this was something with the previous build so I will try to replicate the issue.
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