Attempt to export All resources in KBART fails

Trying to retrieve a KBART export of all resources using route

/erm/sas/<agreement UUID>/resources/export/all/kbart

fails with status 404. Expected is a KBART export of all resources in the agreement (equivalent to /erm/sas/<agreement UUID>/resources/export/all/ but in KBART format rather than JSON)
Note: Exporting the "current" e-resources as KBART list works as expected. The error occurs when downloading a KBART list of "all" e-resources (all tab).

To recreate:

1. Create an agreement
2. Add resource from the internal KB to the agreement
3. View the agreement and expand the Agreement Lines section
4. In the "E-resources covered by this agreement" choose the "All" option button
5. Click "Export as..." and select "KBART"

Expected result:
Download of KBART file containing all the resources in the agreement

Actual Result:
404 response