Test Summary and Chat Notifications stop working

we have a project (kotlin/gradle using a linux container) that it was reporting a proper test summary and sending slack notifications after each build, but now, these features are not working.

I checked the artifacts and they are properly located after each build (Container X/$CIRCLE_TEST_REPORTS/junit/*.xml). I also tested the slack notifications with the “save & send” button and it is working well. I have no clue of what is happening.

Any suggestions?

My repo (amowu/amowu.com) have the same problem.
Save & send button is working well, but each build are not working.