diff --git a/src/AcDream.Core/Physics/ShadowObjectRegistry.cs b/src/AcDream.Core/Physics/ShadowObjectRegistry.cs
index 8a4518a..e0425d8 100644
--- a/src/AcDream.Core/Physics/ShadowObjectRegistry.cs
+++ b/src/AcDream.Core/Physics/ShadowObjectRegistry.cs
@@ -431,4 +431,11 @@ public readonly record struct ShadowEntry(
     /// from <c>PWD._bitfield</c> at <c>CreateObject</c> time via
     /// <see cref="EntityCollisionFlagsExt.FromPwdBitfield(uint)"/>.
     /// </summary>
-    EntityCollisionFlags Flags = EntityCollisionFlags.None);
+    EntityCollisionFlags Flags = EntityCollisionFlags.None,
+    // A6.P4 door fix (2026-05-24): local-to-entity transform for multi-part
+    // entities. ShadowObjectRegistry.UpdatePosition uses these to rebuild
+    // Position/Rotation when the entity moves. Single-shape callers leave
+    // these at default (zero offset, identity rotation) — equivalent to
+    // the shape sitting at the entity's origin.
+    Vector3 LocalPosition = default,
+    Quaternion LocalRotation = default);