I have a web app I built in Web AppBuilder that is running a web map that I created in Map Viewer. In Map Viewer, I have the Feature Display Order set to order by a particular field (this one is a date/time attribute) and set up to sort the features with the most recent dates on top.
My Dashboard with this web map correctly reflects this setting, in addition to my web map in Map Viewer.
However, the map in the Web AppBuilder does not and instead displays features with the older dates on top. This seems to be a bug with Web AppBuilder; if not, I have tried many, many, many "fixes" to no avail. I even tried creating a new Web App, and this did not work.