diff --git a/.forgejo/workflows/grade.yml b/.forgejo/workflows/grade.yml
index 2592b0d..91a9136 100644
--- a/.forgejo/workflows/grade.yml
+++ b/.forgejo/workflows/grade.yml
@@ -14,6 +14,9 @@ jobs:
       image: gitea/runner-images:ubuntu-22.04
     steps:
       - uses: https://data.forgejo.org/actions/checkout@v6
+      - name: Probe workspace
+        run: |
+          docker run --rm -v "$PWD":/probe -v /opt/grade/runner-diag:/diag gitea/runner-images:ubuntu-22.04 sh -c 'echo "PWD_IN_JOB=$PWD" > /diag/probe.txt; ls -la /probe >> /diag/probe.txt; find /probe -maxdepth 2 -name "test_public.py" >> /diag/probe.txt 2>&1'
       - name: Grade (blank fails, solved passes)
         run: |
           docker run --rm --network=none \