diff --git a/Packages/nadena.dev.modular-avatar/Editor/BlendshapeSyncAnimationProcessor.cs b/Packages/nadena.dev.modular-avatar/Editor/BlendshapeSyncAnimationProcessor.cs
index 0fb88eac..4f76ba85 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/BlendshapeSyncAnimationProcessor.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/BlendshapeSyncAnimationProcessor.cs
@@ -94,7 +94,7 @@ namespace nadena.dev.modular_avatar.core.editor
                         _bindingMappings[srcBinding] = dstBindings;
                     }
 
-                    dstBindings.Add(new SummaryBinding(targetObj, binding.Blendshape));
+                    dstBindings.Add(new SummaryBinding(targetObj, binding.LocalBlendshape));
                 }
             }
 
diff --git a/Packages/nadena.dev.modular-avatar/Editor/Inspector/MenuInstallerEditor.cs b/Packages/nadena.dev.modular-avatar/Editor/Inspector/MenuInstallerEditor.cs
index 38a66f4c..02eb38dd 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/Inspector/MenuInstallerEditor.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/Inspector/MenuInstallerEditor.cs
@@ -335,27 +335,6 @@ namespace nadena.dev.modular_avatar.core.editor
 
             return false;
         }
-        
-        private bool IsMenuReachable(VRCAvatarDescriptor avatar, ModularAvatarSubMenuCreator creator, HashSet<ModularAvatarSubMenuCreator> session) 
-        {
-            if (avatar == null) return true;
-            if (this._menuFolderCreators == null) return true;
-
-            if (session.Contains(creator)) return false;
-            if (!this._menuFolderCreators.Contains(creator)) return false;
-
-            if (!creator.enabled) return false;
-            session.Add(creator);
-            switch (creator.installTargetType) 
-            {
-                case InstallTargetType.VRCExpressionMenu:
-                    return creator.installTargetMenu == null || this.IsMenuReachable(avatar, creator.installTargetMenu);
-                case InstallTargetType.FolderCreator:
-                    return creator.installTargetCreator == null || this.IsMenuReachable(avatar, creator.installTargetCreator, session);
-                default:
-                    throw new ArgumentOutOfRangeException();
-            }
-        }
 
         private static ValidateExpressionMenuIconResult ValidateExpressionMenuIcon(VRCExpressionsMenu menu, HashSet<VRCExpressionsMenu> visitedMenus = null) 
         {
diff --git a/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs b/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
index a4429ae6..1b4d7076 100644
--- a/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
+++ b/Packages/nadena.dev.modular-avatar/Editor/MergeArmatureHook.cs
@@ -102,21 +102,27 @@ namespace nadena.dev.modular_avatar.core.editor
             for (int i = 0; i < nSources; i++)
             {
                 var source = constraint.GetSource(i);
-                if (source.sourceTransform == null) continue;
-                if (!BoneRemappings.TryGetValue(source.sourceTransform, out var remap)) continue;
-                var retarget = BoneDatabase.GetRetargetedBone(remap);
-
-                if (retarget != null)
-                {
-                    source.sourceTransform = retarget;
-                }
-                else
-                {
-                    source.sourceTransform = remap;
-                }
-
+                source.sourceTransform = MapConstraintSource(source.sourceTransform);
                 constraint.SetSource(i, source);
             }
+
+            if (constraint is AimConstraint aimConstraint)
+            {
+                aimConstraint.worldUpObject = MapConstraintSource(aimConstraint.worldUpObject);
+            }
+
+            if (constraint is LookAtConstraint lookAtConstraint)
+            {
+                lookAtConstraint.worldUpObject = MapConstraintSource(lookAtConstraint.worldUpObject);
+            }
+        }
+
+        private Transform MapConstraintSource(Transform transform)
+        {
+            if (transform == null) return null;
+            if (!BoneRemappings.TryGetValue(transform, out var remap)) return transform;
+            var retarget = BoneDatabase.GetRetargetedBone(remap);
+            return retarget != null ? retarget : remap;
         }
 
         private void UpdateBoneReferences(Component c, Retargetable retargetable = Retargetable.Disable)
@@ -321,6 +327,9 @@ namespace nadena.dev.modular_avatar.core.editor
                     transformPath = RuntimeUtil.AvatarRootPath(newParent),
                     path = srcPath
                 });
+                // The new merged leaf (if it's retained below) can break parent bone physbones. Add a PB Blocker
+                // to prevent this becoming an issue.
+                mergedSrcBone.GetOrAddComponent<ModularAvatarPBBlocker>();
             }
 
             BoneRemappings[src.transform] = mergedSrcBone.transform;
@@ -397,4 +406,4 @@ namespace nadena.dev.modular_avatar.core.editor
             }
         }
     }
-}
\ No newline at end of file
+}
diff --git a/docs/package.json b/docs/package.json
index e7768865..1466bbdd 100644
--- a/docs/package.json
+++ b/docs/package.json
@@ -29,7 +29,7 @@
   "devDependencies": {
     "@docusaurus/module-type-aliases": "2.2.0",
     "@tsconfig/docusaurus": "^1.0.5",
-    "typescript": "^4.8.4"
+    "typescript": "^4.9.4"
   },
   "resolutions": {
     "trim": "1.0.1",
diff --git a/docs/yarn.lock b/docs/yarn.lock
index 14b79192..44835d1f 100644
--- a/docs/yarn.lock
+++ b/docs/yarn.lock
@@ -7039,10 +7039,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^4.8.4:
-  version "4.9.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.9.3.tgz#3aea307c1746b8c384435d8ac36b8a2e580d85db"
-  integrity sha512-CIfGzTelbKNEnLpLdGFgdyKhG23CKdKgQPOBc+OUNrkJ2vr+KSzsSV5kq5iWhEQbok+quxgGzrAtGWCyU7tHnA==
+typescript@^4.9.4:
+  version "4.9.4"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.9.4.tgz#a2a3d2756c079abda241d75f149df9d561091e78"
+  integrity sha512-Uz+dTXYzxXXbsFpM86Wh3dKCxrQqUcVMxwU54orwlJjOpO3ao8L7j5lH+dWfTwgCwIuM9GQ2kvVotzYJMXTBZg==
 
 ua-parser-js@^0.7.30:
   version "0.7.32"