From 3b8daaeba76a870e1709f4d20ecb718a9924cb34 Mon Sep 17 00:00:00 2001
From: "Felipe Gatica (Paragati Das)" <juzt3@users.noreply.github.com>
Date: Tue, 13 Jan 2026 22:20:41 -0300
Subject: [PATCH] New Class::Init pattern for unity 2021.3.56

Tested in linux
---
 Il2CppInterop.Runtime/Injection/InjectorHelpers.cs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Il2CppInterop.Runtime/Injection/InjectorHelpers.cs b/Il2CppInterop.Runtime/Injection/InjectorHelpers.cs
index be0597e0..43187777 100644
--- a/Il2CppInterop.Runtime/Injection/InjectorHelpers.cs
+++ b/Il2CppInterop.Runtime/Injection/InjectorHelpers.cs
@@ -144,6 +144,12 @@ internal static IntPtr GetIl2CppMethodPointer(MethodBase proxyMethod)
 
         private static readonly MemoryUtils.SignatureDefinition[] s_ClassInitSignatures =
         {
+            new MemoryUtils.SignatureDefinition
+            {
+                pattern = "\xE8\x00\x00\x00\x00\x8B\x3B\x48\x83\xC3",
+                mask = "x????xxxxx",
+                xref = true
+            },
             new MemoryUtils.SignatureDefinition
             {
                 pattern = "\xE8\x00\x00\x00\x00\x0F\xB7\x47\x28\x83",
@@ -162,7 +168,12 @@ private static d_ClassInit FindClassInit()
         {
             static nint GetClassInitSubstitute()
             {
-                if (TryGetIl2CppExport("mono_class_instance_size", out nint classInit))
+                if (TryGetIl2CppExport("il2cpp_runtime_class_init", out nint classInit))
+                {
+                    Logger.Instance.LogTrace("Picked il2cpp_runtime_class_init as a Class::Init substitute");
+                    return classInit;
+                }
+                if (TryGetIl2CppExport("mono_class_instance_size", out classInit))
                 {
                     Logger.Instance.LogTrace("Picked mono_class_instance_size as a Class::Init substitute");
                     return classInit;