I recently did an experiment with flow renderers from a COG imagery tile. I see that in version 5.0 of the ArcGIS API there are new improvements to the behaviour of the renderer on moving the map.
Unfortunately on changing to version 5.0 I'm now seeing strange flashing of vector flow symbology on "no data" parts of my COG.
Before (4.34): https://codepen.io/Jonathan-Dawe/pen/XJKGmmg
After (5.0): https://codepen.io/Jonathan-Dawe/pen/YPGymvw
Is this a bug with the renderer, or an issue with my underlying data?