Tried your repro steps, and yes, there seems to be some issue with the import.
Will try to investigate this further, but currently the team is focused on wrapping up the upcoming 8.0 release, so it could take some time. If this issue is a blocker for you, consider opening an official support request; this way, it may be prioritized a bit higher.
Will give GSS a link to this and ask them to file a bug. Thanks for getting back so fast.
We used to just directly import the xml config resource for the DT plugin as part of our package but it didn't allow for other custom namespaces to coexist.
Also the process here was adopted similar to the 7.5 external vRO Upgrade procedure so open to recommendations.
Thanks for the update, any idea where DT 1.3.3 can be downloaded?
Thank you Ilian