diff --git a/engine/src/flutter/shell/platform/embedder/embedder.h b/engine/src/flutter/shell/platform/embedder/embedder.h
index 60a90f45f94..989b9cce6be 100644
--- a/engine/src/flutter/shell/platform/embedder/embedder.h
+++ b/engine/src/flutter/shell/platform/embedder/embedder.h
@@ -25,12 +25,16 @@
 // - Function signatures (names, argument counts, argument order, and argument
 //   type) cannot change.
 // - The core behavior of existing functions cannot change.
+// - Instead of nesting structures by value within another structure, prefer
+//   nesting by pointer. This ensures that adding members to the nested struct
+//   does not break the ABI of the parent struct.
 // - Instead of array of structures, prefer array of pointers to structures.
 //   This ensures that array indexing does not break if members are added
 //   to the structure.
 //
 // These changes are allowed:
-// - Adding new struct members at the end of a structure.
+// - Adding new struct members at the end of a structure as long as the struct
+//   is not nested within another struct by value.
 // - Adding new enum members with a new value.
 // - Renaming a struct member as long as its type, size, and intent remain the
 //   same.
diff --git a/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen.h b/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen.h
index 46e00f07845..60c995fed61 100644
--- a/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen.h
+++ b/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen.h
@@ -22,6 +22,47 @@
 namespace flutter {
 namespace testing {
 
+// New members must not be added to `FlutterTransformation`
+// as it would break the ABI of `FlutterSemanticsNode`.
+// See: https://github.com/flutter/flutter/issues/121176
+typedef struct {
+  double scaleX;
+  double skewX;
+  double transX;
+  double skewY;
+  double scaleY;
+  double transY;
+  double pers0;
+  double pers1;
+  double pers2;
+} FrozenFlutterTransformation;
+
+// New members must not be added to `FlutterRect` as it would
+// break the ABI of `FlutterSemanticsNode` and `FlutterDamage`.
+// See: https://github.com/flutter/flutter/issues/121176
+// See: https://github.com/flutter/flutter/issues/121347
+typedef struct {
+  double left;
+  double top;
+  double right;
+  double bottom;
+} FrozenFlutterRect;
+
+// New members must not be added to `FlutterPoint` as it would
+// break the ABI of `FlutterLayer`.
+typedef struct {
+  double x;
+  double y;
+} FrozenFlutterPoint;
+
+// New members must not be added to `FlutterDamage` as it would
+// break the ABI of `FlutterPresentInfo`.
+typedef struct {
+  size_t struct_size;
+  size_t num_rects;
+  FrozenFlutterRect* damage;
+} FrozenFlutterDamage;
+
 // New members must not be added to `FlutterSemanticsNode`
 // as it would break the ABI of `FlutterSemanticsUpdate`.
 // See: https://github.com/flutter/flutter/issues/121176
@@ -45,8 +86,8 @@ typedef struct {
   const char* increased_value;
   const char* decreased_value;
   FlutterTextDirection text_direction;
-  FlutterRect rect;
-  FlutterTransformation transform;
+  FrozenFlutterRect rect;
+  FrozenFlutterTransformation transform;
   size_t child_count;
   const int32_t* children_in_traversal_order;
   const int32_t* children_in_hit_test_order;
diff --git a/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen_unittests.cc b/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen_unittests.cc
index eb173fe3519..4235547e831 100644
--- a/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen_unittests.cc
+++ b/engine/src/flutter/shell/platform/embedder/tests/embedder_frozen_unittests.cc
@@ -14,6 +14,47 @@ namespace testing {
 #define ASSERT_EQ_OFFSET(type1, type2, member) \
   ASSERT_EQ(offsetof(type1, member), offsetof(type2, member))
 
+// New members must not be added to `FlutterTransformation`
+// as it would break the ABI of `FlutterSemanticsNode`.
+// See: https://github.com/flutter/flutter/issues/121176
+TEST(EmbedderFrozen, FlutterTransformationIsFrozen) {
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, scaleX);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, skewX);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, transX);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, skewY);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, scaleY);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, transY);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, pers0);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, pers1);
+  ASSERT_EQ_OFFSET(FlutterTransformation, FrozenFlutterTransformation, pers2);
+}
+
+// New members must not be added to `FlutterRect` as it would
+// break the ABI of `FlutterSemanticsNode` and `FlutterDamage`.
+// See: https://github.com/flutter/flutter/issues/121176
+// See: https://github.com/flutter/flutter/issues/121347
+TEST(EmbedderFrozen, FlutterRectIsFrozen) {
+  ASSERT_EQ_OFFSET(FlutterRect, FrozenFlutterRect, left);
+  ASSERT_EQ_OFFSET(FlutterRect, FrozenFlutterRect, top);
+  ASSERT_EQ_OFFSET(FlutterRect, FrozenFlutterRect, right);
+  ASSERT_EQ_OFFSET(FlutterRect, FrozenFlutterRect, bottom);
+}
+
+// New members must not be added to `FlutterPoint` as it would
+// break the ABI of `FlutterLayer`.
+TEST(EmbedderFrozen, FlutterPointIsFrozen) {
+  ASSERT_EQ_OFFSET(FlutterPoint, FrozenFlutterPoint, x);
+  ASSERT_EQ_OFFSET(FlutterPoint, FrozenFlutterPoint, y);
+}
+
+// New members must not be added to `FlutterDamage` as it would
+// break the ABI of `FlutterPresentInfo`.
+TEST(EmbedderFrozen, FlutterDamageIsFrozen) {
+  ASSERT_EQ_OFFSET(FlutterDamage, FrozenFlutterDamage, struct_size);
+  ASSERT_EQ_OFFSET(FlutterDamage, FrozenFlutterDamage, num_rects);
+  ASSERT_EQ_OFFSET(FlutterDamage, FrozenFlutterDamage, damage);
+}
+
 // New members must not be added to `FlutterSemanticsNode`
 // as it would break the ABI of `FlutterSemanticsUpdate`.
 // See: https://github.com/flutter/flutter/issues/121176