simple repro for hooks leaking

They do not seem to though

Assets/Mirror/Examples/ActionMemoryLeak/ActionMemoryLeak.unity

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Assets/Mirror/Examples/ActionMemoryLeak/FatPlayer.cs

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Mirror;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+public class FatPlayer : NetworkBehaviour
+{
+    private byte[] _fatData = new byte[1024 * 1024 * 64];
+    [SyncVar(hook = nameof(OnStringDataChanged))]
+    public string StringData;
+
+    public override void OnStartServer()
+    {
+        transform.position = Random.insideUnitSphere;
+    }
+
+    private void Update()
+    {
+        StringData = Random.value.ToString("N");
+    }
+
+    void OnStringDataChanged(string _, string __)
+    {
+        Debug.Log($"Hook called! {StringData}, FatData is still {_fatData.Length} bytes");
+    }
+}

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Assets/Mirror/Examples/ActionMemoryLeak/UI.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public class UI : MonoBehaviour
+{
+    private void OnGUI()
+    {
+
+        GUILayout.BeginArea(new Rect(20, 120, 215, 300));
+        if (GUILayout.Button("GC.Collect"))
+        {
+            Resources.UnloadUnusedAssets();
+            GC.Collect();
+        }
+        double use = GC.GetTotalMemory(false) / 1024.0 / 1024;
+        GUILayout.TextArea($"{use:N1} MiB");
+        GUILayout.EndArea();
+    }
+}

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@@ -2,6 +2,7 @@
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+    "com.unity.ai.navigation": "1.1.3",
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     "com.unity.testtools.codecoverage": "1.2.5",
     "com.unity.toolchain.macos-arm64-linux-x86_64": "1.0.1",
+    "com.unity.toolchain.win-x86_64-linux-x86_64": "2.0.9",
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     "com.unity.xr.legacyinputhelpers": "2.1.10",
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Packages/packages-lock.json

@@ -10,7 +10,19 @@
       "version": "1.0.0",
       "depth": 0,
       "source": "builtin",
-      "dependencies": {}
+      "dependencies": {
+        "com.unity.modules.tilemap": "1.0.0",
+        "com.unity.modules.uielements": "1.0.0"
+      }
+    },
+    "com.unity.ai.navigation": {
+      "version": "1.1.3",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.modules.ai": "1.0.0"
+      },
+      "url": "https://packages.unity.com"
     },
     "com.unity.ext.nunit": {
       "version": "1.0.6",
@@ -52,25 +64,25 @@
       "url": "https://packages.unity.com"
     },
     "com.unity.settings-manager": {
-      "version": "1.0.3",
+      "version": "2.0.1",
       "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
     "com.unity.sysroot": {
-      "version": "2.0.6",
+      "version": "2.0.10",
       "depth": 1,
       "source": "registry",
       "dependencies": {},
       "url": "https://packages.unity.com"
     },
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-      "version": "2.0.5",
+      "version": "2.0.9",
       "depth": 1,
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       "dependencies": {
-        "com.unity.sysroot": "2.0.6"
+        "com.unity.sysroot": "2.0.10"
       },
       "url": "https://packages.unity.com"
     },
@@ -105,6 +117,16 @@
       },
       "url": "https://packages.unity.com"
     },
+    "com.unity.toolchain.win-x86_64-linux-x86_64": {
+      "version": "2.0.9",
+      "depth": 0,
+      "source": "registry",
+      "dependencies": {
+        "com.unity.sysroot": "2.0.10",
+        "com.unity.sysroot.linux-x86_64": "2.0.9"
+      },
+      "url": "https://packages.unity.com"
+    },
     "com.unity.ugui": {
       "version": "1.0.0",
       "depth": 0,
@@ -256,17 +278,6 @@
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-      "dependencies": {
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ProjectSettings/EditorBuildSettings.asset

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+  m_Scenes:
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+    guid: f5e9366b02fbdb347a9826803ce8d6ca
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ProjectSettings/ProjectSettings.asset

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@@ -48,15 +48,15 @@ PlayerSettings:
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-  unsupportedMSAAFallback: 0
+  m_SpriteBatchVertexThreshold: 300
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+  numberOfMipsStrippedPerMipmapLimitGroup: {}
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   iosShowActivityIndicatorOnLoading: -1
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-  iosAllowHTTPDownload: 1
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@@ -75,7 +75,6 @@ PlayerSettings:
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@@ -254,6 +252,7 @@ PlayerSettings:
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   AndroidKeyaliasName: 
+  AndroidEnableArmv9SecurityFeatures: 0
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@@ -267,13 +266,104 @@ PlayerSettings:
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   AndroidMinifyDebug: 0
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+  m_BuildTargetGroupHDRCubemapEncodingQuality: []
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@@ -342,6 +434,7 @@ PlayerSettings:
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@@ -349,10 +442,11 @@ PlayerSettings:
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@@ -478,6 +572,7 @@ PlayerSettings:
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@@ -567,6 +662,7 @@ PlayerSettings:
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