diff --git a/jstests/noPassthrough/group_spill_with_collation.js b/jstests/noPassthrough/group_spill_with_collation.js
index f612e8b59bb..42d56ca005a 100644
--- a/jstests/noPassthrough/group_spill_with_collation.js
+++ b/jstests/noPassthrough/group_spill_with_collation.js
@@ -2,6 +2,7 @@
  * Tests $group execution with increased spilling and a non-simple collation.
  */

+import {assertArrayEq} from "jstests/aggregation/extras/utils.js";
 import {checkSBEEnabled} from "jstests/libs/sbe_util.js";

 const conn = MongoRunner.runMongod();
@@ -24,12 +25,35 @@ for (let i = 0; i < 1000; i++) {

 assert.commandWorked(db.adminCommand(
     {setParameter: 1, internalQuerySlotBasedExecutionHashAggForceIncreasedSpilling: true}));
+
+// Test that accumulators respect the collation when the group operation spills to disk.
 const caseInsensitive = {
     collation: {locale: "en_US", strength: 2}
 };
-const results =
+let results =
     coll.aggregate([{$group: {_id: null, result: {$addToSet: "$x"}}}], caseInsensitive).toArray();
 assert.eq(1, results.length, results);
 assert.eq({_id: null, result: ["a"]}, results[0]);

+// Test that comparisons of the group key respect the collation when the group operation spills to
+// disk.
+for (let i = 0; i < 1000; i++) {
+    if (i % 3 === 0) {
+        assert.commandWorked(coll.insert({x: 'b'}));
+    } else {
+        assert.commandWorked(coll.insert({x: 'B'}));
+    }
+}
+
+results =
+    coll.aggregate(
+            [{$group: {_id: "$x", normalizedX: {$first: {$toLower: "$x"}}, count: {$count: {}}}}],
+            caseInsensitive)
+        .toArray();
+assertArrayEq({
+    actual: results,
+    expected: [{normalizedX: "a", count: 1000}, {normalizedX: "b", count: 1000}],
+    fieldsToSkip: ["_id"]
+});
+
 MongoRunner.stopMongod(conn);