Metadata can include dates that are in the format which contain a fraction of a second, this however then causes the REST API not to return this value.
The date is still available in the raw XML.

1. Recreate with dates field

2020-11-06T21:37:33.12Z 2017-01-26 2016-09-07

2. Attempt to retrieve doi via https://api.stage.datacite.org/dois/
3. Notice the Accepted date is not appearing at all.