Utility Sub-Model Question

Question concerning utility sub-models and the export/import toolset. I am running into a problem when I export and import utility sub-models from one file to another file and the resulting new sub-model is missing any of my elevation information. Drainage sub-models appear to work correctly with importing the elevations.

Is this a known issue, bug, or limitation with the utility sub-models?

We are using ORD 2021 R2 (10.10.23.15).