diff --git a/backend/tests/test_backlog_rhythm.py b/backend/tests/test_backlog_rhythm.py
index c6bd839c..44a80341 100644
--- a/backend/tests/test_backlog_rhythm.py
+++ b/backend/tests/test_backlog_rhythm.py
@@ -158,6 +158,39 @@ def test_nudge_at_threshold_then_park(tmp_path: Path) -> None:
     assert "park" in parked and "nudge_reporter" not in parked
 
 
+def test_an_open_pr_suppresses_the_chase_and_the_park(tmp_path: Path) -> None:
+    """Parking an item that has an open PR OSCILLATES: `park` says move the
+    card to Backlog, the column derivation says an item with a PR is In Review,
+    so the next pass reports `move_card` to put it back and the pass after that
+    parks it again. #162 did exactly that — parked at 55 quiet days, reported
+    as a mis-placed card, restored, parked again.
+
+    The rule is also right on its own terms: an issue with a PR in flight is
+    not a reporter chase whatever its Awaiting says, and the wait that matters
+    is the review, which the PR half already reports.
+    """
+    for days, unwanted in ((28, "park"), (14, "nudge_reporter")):
+        item = _item(
+            162,
+            labels=["b"],
+            awaiting="reporter",
+            pr=167,
+            column="In Review",
+            board_status="In Review",
+            last_comment=_comment(days),
+        )
+        actions = _actions_for(_run(tmp_path, [item]), 162)
+        assert unwanted not in actions, days
+        # ...and no move_card either, so there is nothing to oscillate against.
+        assert "move_card" not in actions, days
+
+
+def test_the_chase_still_fires_without_a_pr(tmp_path: Path) -> None:
+    """The suppression must not swallow the case the rule exists for."""
+    item = _item(163, labels=["b"], awaiting="reporter", last_comment=_comment(28))
+    assert "park" in _actions_for(_run(tmp_path, [item]), 163)
+
+
 def test_below_threshold_does_not_chase(tmp_path: Path) -> None:
     item = _item(4, labels=["b"], awaiting="reporter", last_comment=_comment(13))
     assert _actions_for(_run(tmp_path, [item]), 4) == set()
diff --git a/scripts/backlog-rhythm.sh b/scripts/backlog-rhythm.sh
index cb0a17d5..a8bcb22d 100755
--- a/scripts/backlog-rhythm.sh
+++ b/scripts/backlog-rhythm.sh
@@ -93,7 +93,21 @@ actions=$(printf '%s' "$digest" | jq \
 
     # Chase once, then park. `is_reporter` false means the last word was ours,
     # so the ball is still with them.
-    (if .awaiting == "reporter"
+    #
+    # AN OPEN PR SUPPRESSES BOTH, and that is not a nicety -- parking one
+    # OSCILLATES. `park` says move the card to Backlog; the column derivation
+    # says an item with an open PR is In Review; so the next pass reports
+    # `move_card` to put it back, and the pass after that parks it again,
+    # forever. #162 did exactly this: parked at 55 quiet days, immediately
+    # reported as a mis-placed card, restored, parked again.
+    #
+    # The rule is right underneath the loop, too. An issue with a PR in flight
+    # is not a reporter chase whatever its `Awaiting` says: the work exists,
+    # and the wait that matters is the PR review, which the PR half of this
+    # pass already reports. Nudging the reporter of a 46-day-stale conflicted
+    # PR asks the wrong person about the wrong thing.
+    (if .pr != null then empty
+     elif .awaiting == "reporter"
         and ((.last_comment.is_reporter // false) | not)
         and quiet_days >= $park
      then {issue: .number, action: "park",