Multiple Dynamic Material Instances not working

Hi,

Side issue: the documentation here is outdated https://substance3d.adobe.com/documentation/integrations/blueprint-dynamic-material-instance-152535142.html , I followed the workaround here https://community.adobe.com/t5/substance-3d-plugins-discussions/dynamic-material-instance-in-substance-unreal-plugin-4-27-clamped-at-256-texture-resolution/m-p/12518889 and was able to get it to work for only 1 instance of a dynamic material.

Main Issue:

I can get this to work for only one instance of the dynamic material.  I am using a cardboard substance material, the first instance appears correct and brown.  As soon as the second instance is created it appears correct and brown, but the first instance changes to an incorrect black/mirror appearance.  This happens for each subsequent instance created, only the latest instance appears correct whereas all the previous ones have the strange black/mirror appearance.      

Another important note: After my blueprint has ran for all instances, I can go into the World Outliner -> select the actors -> select the dynamic material instance -> and toggle anything (like toggle blend-to-global and back, see screenshot), then the material appears correct again.

Please let me know if you need any more information, thanks for your help