I noticed and as soon as I try to edit a data integration job, it no longer works. https://www.screencast.com/t/Y449E3JRI0K
I tried it locally using Notepad, Notepad++ and our IDE, with similar results. As soon as we open and save the file (even with no changes), Data Integration no longer recognizes it.
The reason I wanted to do this was to use the config node https://doc.dynamicweb.com/documentation-9/integration/data-integration-module/integration-providers/xml-provider#5448, which I obviously can't.