Recent failures via api

Noticed a relatively new feature about recent failures of test cases, which I think is pretty good and would like to be able to build reports based on that.
Wondering if there is a possibility to retrieve that via the REST API, currently I’m seeing it as null, no matter what.
I can retrieve it via GraphQL using the same pipeline id, so I suspect may be its a bug with the REST API, or possibly there is some limitation there?
Would be nice to see this work with REST, as with GraphQL, it takes more steps I think to get it (still experimenting though), while with REST, ideally the pipeline id is enough for the same (pipeline//test_report)

Any help is appreciated.