I can't figure out why this automation is returning nothing (and therefore not setting the due date as expected.

I've created the log step and all looks to work fine until the last step as seen here:

It shows that a work item has been edited, but nothing changes. I added it to the description field to eliminate any date format issues and that shows as blank, same as the output in the log.
I've run out of ideas of what the issue could be so asking here.