diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28a027b780639c..9f7d27f1bb61d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -286,6 +286,10 @@ jobs:
         run: py -3 test\util\rpcauth-test.py
 
       - name: Run functional tests
-        env:
-          TEST_RUNNER_EXTRA: ${{ github.event_name != 'pull_request' && '--extended' || '' }}
-        run: py -3 test\functional\test_runner.py --jobs $env:NUMBER_OF_PROCESSORS --ci --quiet --tmpdirprefix=$env:RUNNER_TEMP --combinedlogslen=99999999 --timeout-factor=$env:TEST_RUNNER_TIMEOUT_FACTOR $env:TEST_RUNNER_EXTRA
+        # TODO: Only run functional tests in master.
+        # The test suit regularly fails to complete in windows native github
+        # actions as a child process stops making progress. The root cause has
+        # not yet been determined.
+        # Discussed in https://github.com/bitcoin/bitcoin/pull/28509
+        if: github.event_name != 'pull_request'
+        run: py -3 test\functional\test_runner.py --jobs $env:NUMBER_OF_PROCESSORS --ci --quiet --tmpdirprefix=$env:RUNNER_TEMP --combinedlogslen=99999999 --timeout-factor=$env:TEST_RUNNER_TIMEOUT_FACTOR --extended