diff --git a/.github/actions/create_workflow_report/action.yml b/.github/actions/create_workflow_report/action.yml
index 7ede97fbaed1..0bf2933550f9 100644
--- a/.github/actions/create_workflow_report/action.yml
+++ b/.github/actions/create_workflow_report/action.yml
@@ -16,7 +16,10 @@ runs:
         FINAL: ${{ inputs.final }}
       shell: bash
       run: |
-        pip install clickhouse-driver==0.2.8 numpy==1.26.4 pandas==2.0.3 jinja2==3.1.5
+        # Newer runners have these deps preinstalled; only install on Ubuntu 22.
+        if [[ -f /etc/os-release ]] && . /etc/os-release && [[ "$VERSION_ID" == "22.04" ]]; then
+          pip install clickhouse-driver==0.2.8 numpy==1.26.4 pandas==2.0.3 jinja2==3.1.5
+        fi
 
         CMD="python3 .github/actions/create_workflow_report/create_workflow_report.py"
         ARGS="--actions-run-url $ACTIONS_RUN_URL --known-fails --cves --pr-number $PR_NUMBER"
diff --git a/.github/actions/create_workflow_report/create_workflow_report.py b/.github/actions/create_workflow_report/create_workflow_report.py
index 5dd7c7bc664c..155434070b64 100755
--- a/.github/actions/create_workflow_report/create_workflow_report.py
+++ b/.github/actions/create_workflow_report/create_workflow_report.py
@@ -756,15 +756,15 @@ def get_new_fails_this_pr(
 
 
 def _workflow_config_s3_url(pr_number: int, commit_sha: str, ref_name: str) -> str:
+    # Uploads use a double slash before config_workflow in the S3 key.
     if pr_number == 0:
-        # REF uploads use a double slash before config_workflow in the S3 key.
         return (
             f"https://{S3_BUCKET}.s3.amazonaws.com/REFs/{ref_name}/{commit_sha}/"
             "/config_workflow/workflow_config_masterci.json"
         )
     return (
         f"https://{S3_BUCKET}.s3.amazonaws.com/PRs/{pr_number}/{commit_sha}/"
-        "config_workflow/workflow_config_pr.json"
+        "/config_workflow/workflow_config_pr.json"
     )
 
 
diff --git a/.github/actions/create_workflow_report/workflow_report_hook.sh b/.github/actions/create_workflow_report/workflow_report_hook.sh
index 06edf8867fb8..bbadfdf41f63 100755
--- a/.github/actions/create_workflow_report/workflow_report_hook.sh
+++ b/.github/actions/create_workflow_report/workflow_report_hook.sh
@@ -1,6 +1,9 @@
 #!/bin/bash
 # This script is for generating preview reports when invoked as a post-hook from a praktika job
-pip install clickhouse-driver==0.2.8 numpy==1.26.4 pandas==2.0.3 jinja2==3.1.5
+# Newer runners have these deps preinstalled; only install on Ubuntu 22.
+if [[ -f /etc/os-release ]] && . /etc/os-release && [[ "$VERSION_ID" == "22.04" ]]; then
+  pip install clickhouse-driver==0.2.8 numpy==1.26.4 pandas==2.0.3 jinja2==3.1.5
+fi
 ARGS="--mark-preview --known-fails --cves --actions-run-url $GITHUB_SERVER_URL/$GITHUB_REPOSITORY/actions/runs/$GITHUB_RUN_ID --pr-number $PR_NUMBER"
 CMD="python3 .github/actions/create_workflow_report/create_workflow_report.py"
 $CMD $ARGS