I'm having an issue similar to the end of this discussion, where my domains are not recognized in ArcGIS Pro (2.4.1). The data was published with domains intact, and the features are rendered on the subtypes. When I edit in a web app the domains are working as expected, but when I bring the data into Pro for editing, they are not. Field with domains are simply treated as an unbound text field. Interestingly, when I set the subtype to null, the domains re-appear, and then they will disappear again when I set a subtype value.
The underlying gdb used for publishing doesn't have subtype-specific domains (i.e. every subtype is using the default domains assigned at the feature class level.
Michael Miller or Kelly Gerrow do you have any insight as to what the cause may be, or how to fix this? It's impacting productive editing (just can't do much beyond simple attribute updates in a web app).