Some things that may be occurring....
It might be automatic view clipping which you can try changing to manual https://pro.arcgis.com/en/pro-app/latest/help/mapping/properties/adjust-view-clipping-in-scenes.htm
Another option is maybe the mesh is conflicting with the ground elevation source layer so you can uncheck that in the Contents pane to see if that's the problem.
thanks,
Andrew
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