Prior to ArcGIS Server version 10.9.1 we have been able to draw customgraphics using the SOAP API on top of an ArcGIS Server mapservice. This is used for printing purposes (selections, copyright etc.)
It has been working fine from ArcGIS Server 9 to 10.9 when publishing from ArcMap and 10.8-10.9 services published with ArcGIS Pro (runtime).
At 10.9.1 only services published with ArcMap show custom graphics. When using the ArcGIS Pro (Service Runtime) exportMapImage returns a blank (white) image.
The behaviour is seen at 3 different ArcGIS Server installations. Two federated with Portal and one stand-alone ArcGIS Server site.
Does anybody know if customgraphics is deprecated at 10.9.1 when using the ArcGIS Pro Service runtime?