diff --git a/src/AcDream.App/Rendering/GameWindow.cs b/src/AcDream.App/Rendering/GameWindow.cs
index 3c2454f..12828de 100644
--- a/src/AcDream.App/Rendering/GameWindow.cs
+++ b/src/AcDream.App/Rendering/GameWindow.cs
@@ -6805,6 +6805,23 @@ public sealed class GameWindow : IDisposable
                         System.Console.WriteLine(
                             $"[SEQSTATE] guid={serverGuid:X8} CurrentMotion=0x{ae.Sequencer.CurrentMotion:X8} "
                             + $"CurrentSpeedMod={ae.Sequencer.CurrentSpeedMod:F3}");
+
+                        // #39 fix-3 evidence (2026-05-06): CURRNODE proves
+                        // whether _currNode is actually on the cycle (anim
+                        // ref hash matches FirstCyclic) or stuck somewhere
+                        // else. SCFULL captures _currNode==_firstCyclic only
+                        // at SetCycle return; this captures it per render
+                        // tick so we can see if something resets it later.
+                        var d = ae.Sequencer.CurrentNodeDiag;
+                        int firstHash = ae.Sequencer.FirstCyclicAnimRefHash;
+                        System.Console.WriteLine(
+                            $"[CURRNODE] guid={serverGuid:X8} "
+                            + $"animRef=0x{d.AnimRefHash:X8} firstCyclicAnimRef=0x{firstHash:X8} "
+                            + $"isOnCyclic={d.AnimRefHash == firstHash && firstHash != 0} "
+                            + $"isLooping={d.IsLooping} fr={d.Framerate:F2} "
+                            + $"frame=[{d.StartFrame}..{d.EndFrame}] "
+                            + $"pos={d.FramePosition:F2} qCount={d.QueueCount}");
+
                         rmDiag.LastSeqStateLogTime = nowSec;
                     }
                 }
diff --git a/src/AcDream.Core/Physics/AnimationSequencer.cs b/src/AcDream.Core/Physics/AnimationSequencer.cs
index 56e03e4..4bae508 100644
--- a/src/AcDream.Core/Physics/AnimationSequencer.cs
+++ b/src/AcDream.Core/Physics/AnimationSequencer.cs
@@ -254,6 +254,39 @@ public sealed class AnimationSequencer
     public int QueueCount => _queue.Count;
     public bool HasCurrentNode => _currNode != null;
 
+    /// <summary>
+    /// Diagnostic snapshot of <c>_currNode</c>'s identity + frame state, for
+    /// the per-tick CURRNODE log line in <c>GameWindow.TickAnimations</c>.
+    /// Lets the caller see whether the actual node being read by Advance /
+    /// BuildBlendedFrame is what SetCycle was supposed to leave it on.
+    /// AnimRefHash uses object-identity hashing on the Animation reference
+    /// so different Walk vs Run anim resources can be distinguished even
+    /// without exposing the full Animation type.
+    /// </summary>
+    public (int AnimRefHash, bool IsLooping, double Framerate, int StartFrame, int EndFrame, double FramePosition, int QueueCount) CurrentNodeDiag
+    {
+        get
+        {
+            if (_currNode is null)
+                return (0, false, 0.0, 0, 0, 0.0, _queue.Count);
+            var n = _currNode.Value;
+            int hash = System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(n.Anim);
+            return (hash, n.IsLooping, n.Framerate, n.StartFrame, n.EndFrame, _framePosition, _queue.Count);
+        }
+    }
+
+    /// <summary>
+    /// Diagnostic: the AnimRefHash for the FIRST cyclic node in the queue
+    /// (i.e., what SetCycle is trying to land us on for a locomotion cycle).
+    /// Compare against <see cref="CurrentNodeDiag"/>'s AnimRefHash to see
+    /// whether <c>_currNode</c> is actually pointing at the new cycle or
+    /// something stale.
+    /// </summary>
+    public int FirstCyclicAnimRefHash =>
+        _firstCyclic is null
+            ? 0
+            : System.Runtime.CompilerServices.RuntimeHelpers.GetHashCode(_firstCyclic.Value.Anim);
+
     // ── Private state ────────────────────────────────────────────────────────
 
     private readonly Setup _setup;