Using userdata to set default blendmode is not working

I'm following the directions on this page to set a default blendmode using userdata in Designer:
https://substance3d.adobe.com/documentation/spdoc/user-data-140902410.html#section5

No matter what value I select, the default blend mode does not update when I update my asset in Painter and drag it onto my model.  Other userdata options like the one to disable a channel disable=(true) do have an effect when I add them, so I know it isn't an issue with the data not updating.  Is this functionality still supported?  Is there possibly anything else I'm doing wrong.  For example on my substance material, I am selecting the 'diffuse' Output node and adding to the User Data - blendingmode=multiply .  It has no effect in Painter.