I have a few embedded data fields that I am trying to populate with timestamps at certain progress milestones throughout my survey. They appear to be working in the survey preview but when I export the data these fields are all blank. I’ve been able to successfully export some other embedded data fields also set through javascript, so I can’t work out why these ones aren’t working.
The embedded data fields are created at the top of my survey flow with the type set to date:

Throughout the survey I use javascript to set the value

And I’m pretty sure it’s working because if I pipe the timestamps in to a question at the end of the survey I get appropriate data

But when I go to export my dataset all of the fields are blank.
I’m pretty stumped, I don’t understand why I would be able to pipe data from the embedded data field but not see it in the export?
Any help much appreciated,
Thanks
Katie