diff --git a/src/display/gl/scene.cpp b/src/display/gl/scene.cpp
index 483f2203..22b444d7 100644
--- a/src/display/gl/scene.cpp
+++ b/src/display/gl/scene.cpp
@@ -224,14 +224,14 @@ bool SceneElement::sandbox_deserialize_scene_element(const void *&data, mkxp_san
 		uint64_t value = creationStamp;
 		if (!mkxp_sandbox::sandbox_deserialize(creationStamp, data, max_size)) return false;
 		if (creationStamp != value) {
-			deserModified = true;
+			deserSceneElementModified = true;
 		}
 	}
 	{
 		int32_t value = (int32_t)z;
 		if (!mkxp_sandbox::sandbox_deserialize((int32_t &)z, data, max_size)) return false;
 		if (z != value) {
-			deserModified = true;
+			deserSceneElementModified = true;
 		}
 	}
 	if (!mkxp_sandbox::sandbox_deserialize(visible, data, max_size)) return false;
@@ -241,6 +241,6 @@ bool SceneElement::sandbox_deserialize_scene_element(const void *&data, mkxp_san
 
 void SceneElement::sandbox_deserialize_begin_scene_element()
 {
-	deserModified = false;
+	deserSceneElementModified = false;
 }
 #endif // MKXPZ_REROO
diff --git a/src/display/gl/scene.h b/src/display/gl/scene.h
index 1ed3834d..00d83e9d 100644
--- a/src/display/gl/scene.h
+++ b/src/display/gl/scene.h
@@ -114,7 +114,7 @@ public:
 
 	Scene *scene;
 #ifdef MKXPZ_RETRO
-	bool deserModified;
+	bool deserSceneElementModified;
 #endif // MKXPZ_RETRO
 
 protected:
diff --git a/src/display/plane.cpp b/src/display/plane.cpp
index 7a4e04f4..f90257bf 100644
--- a/src/display/plane.cpp
+++ b/src/display/plane.cpp
@@ -437,7 +437,7 @@ void Plane::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (deserModified) {
+	if (deserSceneElementModified) {
 		scene->reinsert(*this);
 	}
 }
diff --git a/src/display/sprite.cpp b/src/display/sprite.cpp
index 4d5f21a9..f81025b9 100644
--- a/src/display/sprite.cpp
+++ b/src/display/sprite.cpp
@@ -1047,7 +1047,7 @@ void Sprite::sandbox_deserialize_end()
     }
 
     if (isDisposed()) return;
-    if (deserModified) {
+    if (deserSceneElementModified) {
         scene->reinsert(*this);
     }
 }
diff --git a/src/display/tilemap.cpp b/src/display/tilemap.cpp
index d59e1af3..9e2e67ad 100644
--- a/src/display/tilemap.cpp
+++ b/src/display/tilemap.cpp
@@ -1712,11 +1712,11 @@ void Tilemap::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (p->elem.ground->deserModified) {
+	if (p->elem.ground->deserSceneElementModified) {
 		p->elem.ground->scene->reinsert(*p->elem.ground);
 	}
 	for (size_t i = 0; i < zlayersMax; ++i) {
-		if (p->elem.zlayers[i]->deserModified) {
+		if (p->elem.zlayers[i]->deserSceneElementModified) {
 			p->elem.zlayers[i]->scene->reinsert(*p->elem.zlayers[i]);
 		}
 	}
diff --git a/src/display/tilemapvx.cpp b/src/display/tilemapvx.cpp
index dc73649f..fa3d408c 100644
--- a/src/display/tilemapvx.cpp
+++ b/src/display/tilemapvx.cpp
@@ -792,10 +792,10 @@ void TilemapVX::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (p->above.deserModified) {
+	if (p->above.deserSceneElementModified) {
 		p->above.scene->reinsert(p->above);
 	}
-	if (p->deserModified) {
+	if (p->deserSceneElementModified) {
 		p->scene->reinsert(*p);
 	}
 }
diff --git a/src/display/viewport.cpp b/src/display/viewport.cpp
index aed1f15a..f6746727 100644
--- a/src/display/viewport.cpp
+++ b/src/display/viewport.cpp
@@ -37,6 +37,10 @@
 #define GUARD_V(value, expression) do { expression; if (exception.is_error()) return value; } while (0)
 #define GUARD(expression) GUARD_V(, expression)
 
+#ifdef MKXPZ_RETRO
+static uint64_t next_id = 1;
+#endif // MKXPZ_RETRO
+
 struct ViewportPrivate
 {
 	/* Needed for geometry changes */
@@ -46,6 +50,7 @@ struct ViewportPrivate
 	sigslot::connection rectCon;
 #ifdef MKXPZ_RETRO
 	Rect deserSavedRect;
+	bool deserScreenRectChanged;
 #endif // MKXPZ_RETRO
 
 	Color *color;
@@ -105,6 +110,9 @@ struct ViewportPrivate
 
 Viewport::Viewport(int x, int y, int width, int height)
     : SceneElement(*shState->screen()),
+#ifdef MKXPZ_RETRO
+      id(next_id++),
+#endif // MKXPZ_RETRO
       sceneLink(this)
 {
 	initViewport(x, y, width, height);
@@ -112,6 +120,9 @@ Viewport::Viewport(int x, int y, int width, int height)
 
 Viewport::Viewport(Rect *rect)
     : SceneElement(*shState->screen()),
+#ifdef MKXPZ_RETRO
+      id(next_id++),
+#endif // MKXPZ_RETRO
       sceneLink(this)
 {
 	initViewport(rect->x, rect->y, rect->width, rect->height);
@@ -119,6 +130,9 @@ Viewport::Viewport(Rect *rect)
 
 Viewport::Viewport()
     : SceneElement(*shState->screen()),
+#ifdef MKXPZ_RETRO
+      id(next_id++),
+#endif // MKXPZ_RETRO
       sceneLink(this)
 {
 	const Graphics &graphics = shState->graphics();
@@ -236,8 +250,9 @@ void Viewport::releaseResources()
 bool Viewport::sandbox_serialize(void *&data, mkxp_sandbox::wasm_size_t &max_size) const
 {
 	if (!mkxp_sandbox::sandbox_serialize(p->screenRect, data, max_size)) return false;
-	if (!mkxp_sandbox::sandbox_serialize(p->isOnScreen, data, max_size)) return false;
+
 	if (!sandbox_serialize_scene_element(data, max_size)) return false;
+
 	if (!mkxp_sandbox::sandbox_serialize(p->rect, data, max_size)) return false;
 	if (!mkxp_sandbox::sandbox_serialize(p->color, data, max_size)) return false;
 	if (!mkxp_sandbox::sandbox_serialize(p->tone, data, max_size)) return false;
@@ -247,9 +262,16 @@ bool Viewport::sandbox_serialize(void *&data, mkxp_sandbox::wasm_size_t &max_siz
 
 bool Viewport::sandbox_deserialize(const void *&data, mkxp_sandbox::wasm_size_t &max_size)
 {
-	if (!mkxp_sandbox::sandbox_deserialize(p->screenRect, data, max_size)) return false;
-	if (!mkxp_sandbox::sandbox_deserialize(p->isOnScreen, data, max_size)) return false;
+	{
+		IntRect value = p->screenRect;
+		if (!mkxp_sandbox::sandbox_deserialize(p->screenRect, data, max_size)) return false;
+		if (p->screenRect != value) {
+			p->deserScreenRectChanged = true;
+		}
+	}
+
 	if (!sandbox_deserialize_scene_element(data, max_size)) return false;
+
 	if (!mkxp_sandbox::sandbox_deserialize(p->rect, data, max_size)) return false;
 	if (!mkxp_sandbox::sandbox_deserialize(p->color, data, max_size)) return false;
 	if (!mkxp_sandbox::sandbox_deserialize(p->tone, data, max_size)) return false;
@@ -269,6 +291,8 @@ void Viewport::sandbox_deserialize_begin()
 	} else {
 		p->deserSavedRect.set(0, 0, 0, 0);
 	}
+
+	p->deserScreenRectChanged = false;
 }
 
 void Viewport::sandbox_deserialize_end()
@@ -282,7 +306,12 @@ void Viewport::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (deserModified) {
+	if (p->deserScreenRectChanged) {
+		p->recomputeOnScreen();
+	}
+
+	if (isDisposed()) return;
+	if (deserSceneElementModified) {
 		scene->reinsert(*this);
 	}
 }
@@ -349,15 +378,28 @@ void ViewportElement::sandbox_deserialize_begin_viewport_element()
 	sandbox_deserialize_begin_scene_element();
 
 	viewportDispCon.disconnect();
+
+	deserSavedViewportId = m_viewport == nullptr ? 0 : m_viewport->id;
 }
 
 void ViewportElement::sandbox_deserialize_end_viewport_element()
 {
 	if (m_viewport != nullptr) {
-		viewportDispCon = m_viewport->wasDisposed.connect(&ViewportElement::viewportElementDisposal, this);
-		if (m_viewport->isDisposed()) {
-			viewportElementDisposal();
+		if (rgssVer == 1) {
+			viewportDispCon = m_viewport->wasDisposed.connect(&ViewportElement::viewportElementDisposal, this);
+			if (m_viewport->isDisposed()) {
+				viewportElementDisposal();
+			}
 		}
+		if (m_viewport->id != deserSavedViewportId) {
+			setScene(*m_viewport);
+			onViewportChange();
+			onGeometryChange(scene->getGeometry());
+		}
+	} else if (deserSavedViewportId != 0) {
+		setScene(*shState->screen());
+		onViewportChange();
+		onGeometryChange(scene->getGeometry());
 	}
 }
 #endif // MXKPZ_RETRO
diff --git a/src/display/viewport.h b/src/display/viewport.h
index 7892938d..5fecf508 100644
--- a/src/display/viewport.h
+++ b/src/display/viewport.h
@@ -52,6 +52,8 @@ public:
 	void initDynAttribs();
 
 #ifdef MKXPZ_RETRO
+	const uint64_t id; // Globally unique nonzero ID for this viewport, for change detection during save state deserialization
+
 	bool sandbox_serialize(void *&data, mkxp_sandbox::wasm_size_t &max_size) const;
 	bool sandbox_deserialize(const void *&data, mkxp_sandbox::wasm_size_t &max_size);
 	void sandbox_deserialize_begin();
@@ -100,6 +102,9 @@ private:
 	void (*m_dispose)(void *);
 	Viewport *m_viewport;
 	sigslot::connection viewportDispCon;
+#ifdef MKXPZ_RETRO
+	uint64_t deserSavedViewportId;
+#endif // MKXPZ_RETRO
 	void viewportElementDisposal();
 };
 
diff --git a/src/display/window.cpp b/src/display/window.cpp
index 45eb50fd..64930131 100644
--- a/src/display/window.cpp
+++ b/src/display/window.cpp
@@ -1089,7 +1089,7 @@ void Window::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (deserModified) {
+	if (deserSceneElementModified) {
 		scene->reinsert(*this);
 	}
 }
diff --git a/src/display/windowvx.cpp b/src/display/windowvx.cpp
index 1062fc3c..0e571df7 100644
--- a/src/display/windowvx.cpp
+++ b/src/display/windowvx.cpp
@@ -1355,7 +1355,7 @@ void WindowVX::sandbox_deserialize_end()
 	}
 
 	if (isDisposed()) return;
-	if (deserModified) {
+	if (deserSceneElementModified) {
 		scene->reinsert(*this);
 	}
 }