Hi, I got a problem when I loading a Featurelayer from my GIS server with ArcGIS JS 4.9, and it will be broken on my Map.
The following picture is the broken Featurelayer.

But when I go back to use 4.8, it returned to normal. like this:

This problem has been bothering me for a long time.
Does anyone know how to solve it?
Thanks in advance!
PS: Sorry for my poor English : P