diff --git a/.gitea/actions/rust-cache/action.yml b/.gitea/actions/rust-cache/action.yml
index e378af6..af9ced9 100644
--- a/.gitea/actions/rust-cache/action.yml
+++ b/.gitea/actions/rust-cache/action.yml
@@ -44,6 +44,8 @@ runs:
 
     - name: Save cache
       id: cache-save
+      env:
+        ACTIONS_CACHE_SERVICE_V2: "0"
       uses: https://gitea.com/actions/cache@v3
       with:
         path: |
@@ -55,6 +57,15 @@ runs:
         key: rust-linux-${{ steps.cache-key.outputs.hash }}
         save-always: true
 
+    - name: Debug: print save outputs
+      shell: bash
+      run: |
+        echo "=== Save action outputs ==="
+        echo "cache-hit: '${{ steps.cache-save.outputs.cache-hit }}'"
+        echo "key: '${{ steps.cache-save.outputs.key }}'"
+        echo "=== All outputs ==="
+        env | grep -i ACTIONS_CACHE || echo "No ACTIONS_CACHE env vars in shell"
+
     - name: Twirp probe via curl (debug)
       shell: bash
       env:
@@ -65,17 +76,27 @@ runs:
         echo "=== Cache env vars ==="
         echo "ACTIONS_CACHE_URL=$ACTIONS_CACHE_URL"
         echo "ACTIONS_RUNTIME_TOKEN len=${#ACTIONS_RUNTIME_TOKEN}"
-        echo "ACTIONS_RESULTS_URL=$ACTIONS_RESULTS_URL"
         if [ -n "$ACTIONS_CACHE_URL" ]; then
-          echo "=== Twirp probe (v1): GetCacheEntryDownloadURL ==="
-          BODY=$(printf '{"key":"rust-linux-%s","restoreKeys":[],"version":"%s"}' "$HASH" "$HASH")
-          RESP=$(curl -s -X POST \
+          HASH="${{ steps.cache-key.outputs.hash }}"
+          KEY="rust-linux-$HASH"
+          echo "=== Twirp v1: GetCacheEntryDownloadURL ==="
+          BODY=$(printf '{"key":"%s","restoreKeys":[],"version":"%s"}' "$KEY" "$HASH")
+          echo "POST $ACTIONS_CACHE_URL/twirp/github.actions.results.api.v1.CacheService/GetCacheEntryDownloadURL"
+          echo "Body: $BODY"
+          RESP=$(curl -si -X POST \
             -H "Content-Type: application/json" \
             -H "Authorization: Bearer $ACTIONS_RUNTIME_TOKEN" \
             "$ACTIONS_CACHE_URL/twirp/github.actions.results.api.v1.CacheService/GetCacheEntryDownloadURL" \
             -d "$BODY" \
-            -w "\nHTTP_STATUS:%{http_code}" 2>&1)
+            2>&1)
           echo "$RESP"
+          echo ""
+          echo "=== Also try list cache API ==="
+          LIST_RESP=$(curl -si \
+            -H "Authorization: Bearer $ACTIONS_RUNTIME_TOKEN" \
+            "$ACTIONS_CACHE_URL/_apis/artifactcache/caches?key=$KEY&version=$HASH" \
+            2>&1)
+          echo "$LIST_RESP"
         else
           echo "ACTIONS_CACHE_URL is empty"
         fi