Does anyone know how to delete Test Item links to external DevOps test cases?

Is it possible to delete external test case links to Azure DevOps test cases?

Removal does not seem possible via the UI.

I tried removing the Test Item, re-creating it, then correctly re-linking it to the correct Devops Test Case and somehow the incorrect link remains because the underlying TC Keword Test is the same.

Are there any back-end ways of doing this?