Resource locator field fails in IE 11 with Endpoint-less datasets / resources

[Cheddam]

Tested in: Silverstripe CMS 4.5.0-rc1, CKAN Registry 1.1.1
Example entries: family-services-directory, 496d2b91-2e9a-4e72-9c07-cf41141aefa6

In Chrome, these are parsed and replaced with the full URL to the Data source, and they also populate the Resource Name dropdown and the GridField of columns.

In IE 11:

• The first entry successfully populates the Resource Name dropdown and GridField but leaves the Data source URL field empty, and on subsequent saves both this and the Resource Name field are empty, resulting in no data being rendered on the page. This behaviour has also been observed when specifying a full dataset URL, e.g. https://catalogue.data.govt.nz/dataset/family-services-directory
• The second entry results in a validation error - "The provided data source URL does not appear to be a valid CKAN data set."
• Neither result in console errors.