diff --git a/.github/workflows/test_functional.yml b/.github/workflows/test_functional.yml
index 2664f6fc08f..a6d1e8fd480 100644
--- a/.github/workflows/test_functional.yml
+++ b/.github/workflows/test_functional.yml
@@ -41,7 +41,7 @@ jobs:
         os: ['macos-latest']
         python-version: ['3.9']
         test-base: ['tests/f']
-        chunk: ['1/5', '2/5', '3/5', '4/5']
+        chunk: ['1/1']
         platform: ['_local_background*']
 
     env:
@@ -167,20 +167,20 @@ jobs:
       - name: Configure git  # Needed by the odd test
         uses: cylc/release-actions/configure-git@v1
 
-      - name: Filter Tests
-        env:
-          # NOTE: we only want the CHUNK set in this step else we will
-          # re-chunk tests later when they run
-          CHUNK: ${{ matrix.chunk }}
-        run: |
-          etc/bin/run-functional-tests \
-            --dry \
-            ${{ matrix.test-base }} \
-            > test-file
-          if [[ $REMOTE_PLATFORM == 'true' ]]; then
-            # skip tests that don't configure platform requirements
-            grep -l --color=never REQUIRE_PLATFORM $(cat test-file) > test-file
-          fi
+      # - name: Filter Tests
+      #   env:
+      #     # NOTE: we only want the CHUNK set in this step else we will
+      #     # re-chunk tests later when they run
+      #     CHUNK: ${{ matrix.chunk }}
+      #   run: |
+      #     etc/bin/run-functional-tests \
+      #       --dry \
+      #       ${{ matrix.test-base }} \
+      #       > test-file
+      #     if [[ $REMOTE_PLATFORM == 'true' ]]; then
+      #       # skip tests that don't configure platform requirements
+      #       grep -l --color=never REQUIRE_PLATFORM $(cat test-file) > test-file
+      #     fi
 
       - name: Test
         id: test
@@ -197,7 +197,7 @@ jobs:
           etc/bin/run-functional-tests \
               -j "${NPROC}" \
               --state=save \
-              $(cat test-file) \
+              tests/f/shutdown/08-now1.t \
               || (echo "finished=true" >> $GITHUB_OUTPUT && false)
 
       - name: Time Out
@@ -218,7 +218,7 @@ jobs:
           etc/bin/run-functional-tests \
               -j 1 \
               -v \
-              --state=save,failed $(cat test-file)
+              --state=save,failed tests/f/shutdown/08-now1.t
 
       - name: Copy cylc-run out of container
         if: failure() && steps.test.outcome == 'failure' && env.REMOTE_PLATFORM == 'true'