We have a problem where the Configure Arcade Expression Window does not load correctly. We get this when we attempt to enter the expression to define a Geometry on the Map Fields component as well as Calculate field. The window looks like below
However when opening the Configure Arcade Expression Window via the Join tool the window loads correctly
After more testing we have found that the error is erratic in the way that on some of the Map Field components in the same Real Time Analytic the Configure Arcade Expression would load and on others it would not. The following Script error is presented on instances where it does not load
Thank you for raising this issue! We have just recently discovered this issue and believe that it is related to the recent ArcGIS Online upgrade. Investigation is ongoing and a fix will be applied as soon as possible.
As an additional update following investigation, we have a fix for this behavior. We are targeting implementation of this fix for mid-next week.
In order to support you building your analytics prior to next week, please reach out to Esri Technical Support as they will be able to assist with a workaround of manually populating your desired expression via additional backend configuration mechanisms.