diff --git a/.github/scripts/test-r2-artifact-mirror.py b/.github/scripts/test-r2-artifact-mirror.py
index 8557838f62..6d9abc23c6 100755
--- a/.github/scripts/test-r2-artifact-mirror.py
+++ b/.github/scripts/test-r2-artifact-mirror.py
@@ -19,6 +19,7 @@
 CURRENT_RUN_HELPER = Path(__file__).with_name(
     "publish-current-run-artifact-mirror.sh"
 )
+SNAPSHOT_WORKFLOW = Path(__file__).parents[1] / "workflows" / "refresh-mainnet-snapshot.yml"
 SPEC = importlib.util.spec_from_file_location("r2_artifact_mirror", SCRIPT)
 assert SPEC and SPEC.loader
 MODULE = importlib.util.module_from_spec(SPEC)
@@ -31,6 +32,14 @@
     "try-runtime-snap-v0.10.1-devnet",
 }
 
+snapshot_workflow = SNAPSHOT_WORKFLOW.read_text(encoding="utf-8")
+mainnet_mirror_step = snapshot_workflow.split(
+    "  # try-runtime state snapshots", maxsplit=1
+)[0].split("      - name: Mirror snapshot for fleet prefetch", maxsplit=1)[1]
+assert "publish-current-run-artifact-mirror.sh" in mainnet_mirror_step
+assert "mainnet-snapshot" in mainnet_mirror_step
+assert "steps.upload-snapshot.outputs.artifact-digest" not in mainnet_mirror_step
+
 
 assert MODULE.validate_endpoint(
     "https://3dc4cebb791314d78848969042fb3382.r2.cloudflarestorage.com"
diff --git a/.github/workflows/refresh-mainnet-snapshot.yml b/.github/workflows/refresh-mainnet-snapshot.yml
index 1cc63e6278..edea7c8776 100644
--- a/.github/workflows/refresh-mainnet-snapshot.yml
+++ b/.github/workflows/refresh-mainnet-snapshot.yml
@@ -112,16 +112,9 @@ jobs:
       - name: Mirror snapshot for fleet prefetch
         env:
           GH_TOKEN: ${{ github.token }}
-          ARTIFACT_ID: ${{ steps.upload-snapshot.outputs.artifact-id }}
-          ARTIFACT_DIGEST: ${{ steps.upload-snapshot.outputs.artifact-digest }}
-        run: |
-          set -euo pipefail
-          .github/scripts/publish-artifact-mirror.sh \
-            "$ARTIFACT_ID" \
-            mainnet-snapshot \
-            "$ARTIFACT_DIGEST" \
-            "$GITHUB_SHA" \
-            .github/workflows/refresh-mainnet-snapshot.yml
+        run: >-
+          .github/scripts/publish-current-run-artifact-mirror.sh
+          mainnet-snapshot
 
   # try-runtime state snapshots, one job per network so one flaky endpoint
   # doesn't prevent the others from publishing. The .snap format
diff --git a/.github/workflows/validate-sccache.yml b/.github/workflows/validate-sccache.yml
index 72c10e1250..9e80c6afec 100644
--- a/.github/workflows/validate-sccache.yml
+++ b/.github/workflows/validate-sccache.yml
@@ -41,6 +41,7 @@ on:
       - ".github/workflows/check-node-compat.yml"
       - ".github/workflows/mainnet-clone-preview.yml"
       - ".github/workflows/runtime-checks.yml"
+      - ".github/workflows/refresh-mainnet-snapshot.yml"
       - ".github/workflows/sccache-warm.yml"
       - ".github/workflows/typescript-e2e.yml"
       - ".github/workflows/validate-sccache.yml"