diff --git a/test/types/base.test.ts b/test/types/base.test.ts
index 9dc376b5c7e..c8198d02287 100644
--- a/test/types/base.test.ts
+++ b/test/types/base.test.ts
@@ -46,3 +46,8 @@ function gh11478() {
 function gh10139() {
   mongoose.set('timestamps.createdAt.immutable', false);
 }
+
+function gh12100() {
+  mongoose.syncIndexes({ continueOnError: true, noResponse: true });
+  mongoose.syncIndexes({ continueOnError: false, noResponse: true });
+}
diff --git a/test/types/models.test.ts b/test/types/models.test.ts
index 58941ae10aa..5d8e33bd1d2 100644
--- a/test/types/models.test.ts
+++ b/test/types/models.test.ts
@@ -319,3 +319,12 @@ function gh11911() {
     update: changes
   });
 }
+
+function gh12100() {
+  const schema = new Schema();
+
+  const Model = model('Model', schema);
+
+  Model.syncIndexes({ continueOnError: true, noResponse: true });
+  Model.syncIndexes({ continueOnError: false, noResponse: true });
+}