OPC UA struct data type?

Can you try editing your gateway’s ignition.conf and adding this parameter to the “Java Additional Parameters” section:

-Dignition.tags.processbackfill=true

It would end up looking something like this:

# Java Additional Parameters
wrapper.java.additional.1=-Ddata.dir=data
wrapper.java.additional.2=-Dignition.tags.processbackfill=true
#wrapper.java.additional.2=-Xdebug
#wrapper.java.additional.3=-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=*:8000

You will have to restart your gateway for this to take effect.