diff --git a/crates/polars-lazy/src/physical_plan/expressions/apply.rs b/crates/polars-lazy/src/physical_plan/expressions/apply.rs
index 7a447dbade11..cb6e15e43a50 100644
--- a/crates/polars-lazy/src/physical_plan/expressions/apply.rs
+++ b/crates/polars-lazy/src/physical_plan/expressions/apply.rs
@@ -354,10 +354,12 @@ impl PhysicalExpr for ApplyExpr {
                 },
                 ApplyOptions::GroupWise => self.apply_multiple_group_aware(acs, df),
                 ApplyOptions::ElementWise => {
-                    if acs
-                        .iter()
-                        .any(|ac| matches!(ac.agg_state(), AggState::AggregatedList(_)))
-                    {
+                    if acs.iter().any(|ac| {
+                        matches!(
+                            ac.agg_state(),
+                            AggState::AggregatedList(_) | AggState::AggregatedScalar(_)
+                        )
+                    }) {
                         self.apply_multiple_group_aware(acs, df)
                     } else {
                         apply_multiple_elementwise(
diff --git a/py-polars/tests/unit/operations/test_group_by.py b/py-polars/tests/unit/operations/test_group_by.py
index 85ed79f9be40..e432d1e8b9bd 100644
--- a/py-polars/tests/unit/operations/test_group_by.py
+++ b/py-polars/tests/unit/operations/test_group_by.py
@@ -975,3 +975,13 @@ def test_partitioned_group_by_14954(monkeypatch: Any) -> None:
             [False, False, False, False, False, False, False, False, False, False],
         ],
     }
+
+
+def test_aggregated_scalar_elementwise_15602() -> None:
+    df = pl.DataFrame({"group": [1, 2, 1]})
+
+    out = df.group_by("group", maintain_order=True).agg(
+        foo=pl.col("group").is_between(1, pl.max("group"))
+    )
+    expected = pl.DataFrame({"group": [1, 2], "foo": [[True, True], [True]]})
+    assert_frame_equal(out, expected)