Although this doesn't have to due with Roads and Highways directly, this topic involves m-enabled datasets and I'm hoping someone here can provide an explanation or highlight whether the behavior described below identifies a bug in ArcGIS Pro since the RHUG community is well-versed in m-enabled datasets.
When clicking an m-enabled point geometry feature class in ArcGIS Pro, the pop-up doesn't display the measure value. Instead, the measure value is left blank but it adds six m-related fields at the bottom of the popup. In a past version of ArcGIS Pro, it did display the measure value for the measure field (in addition to those six extra fields).