diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 3e3e7c9ec62..4078af36951 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -116,7 +116,7 @@ jobs:
     - bash: ./scripts/ci/test_source.sh
       displayName: 'Run integration test and build test'
       env:
-        ADO_PULL_REQUEST_LATEST_COMMIT: $(System.PullRequest.SourceCommitId)
+        ADO_PULL_REQUEST_LATEST_COMMIT: HEAD
         ADO_PULL_REQUEST_TARGET_BRANCH: $(System.PullRequest.TargetBranch)
 
 - job: LintModifiedExtensions
@@ -153,7 +153,7 @@ jobs:
         AZURE_EXTENSION_DIR=~/.azure/cliextensions python scripts/ci/verify_linter.py
       displayName: "CLI Linter on Modified Extension"
       env:
-        ADO_PULL_REQUEST_LATEST_COMMIT: $(System.PullRequest.SourceCommitId)
+        ADO_PULL_REQUEST_LATEST_COMMIT: HEAD
         ADO_PULL_REQUEST_TARGET_BRANCH: $(System.PullRequest.TargetBranch)
 
 - job: IndexRefDocVerify
diff --git a/scripts/ci/test_source.py b/scripts/ci/test_source.py
index 2de55fcf9d1..feaa3fbc745 100755
--- a/scripts/ci/test_source.py
+++ b/scripts/ci/test_source.py
@@ -7,6 +7,7 @@
 
 from __future__ import print_function
 
+import logging
 import os
 import sys
 import tempfile
@@ -21,6 +22,7 @@
 
 from util import SRC_PATH
 
+logger = logging.getLogger(__name__)
 
 ALL_TESTS = []
 
@@ -55,6 +57,10 @@
     if pkg_name and os.path.isdir(os.path.join(src_d_full, pkg_name, 'tests')):
         ALL_TESTS.append((pkg_name, src_d_full))
 
+logger.warning(f'ado_branch_last_commit: {ado_branch_last_commit}, '
+               f'ado_target_branch: {ado_target_branch}, '
+               f'ALL_TESTS: {ALL_TESTS}.')
+
 
 class TestExtensionSourceMeta(type):
     def __new__(mcs, name, bases, _dict):