Question No ahead of time (AOT) code was generated issue in Unity 2020.3

Hi! We tried to migrate to Unity version 2020.3.8 from 2019.4.18, but after update encountered an error connected with Zenject

Code (CSharp):

1. 2021.05.20 20:44:57.038 12605 12663 Error Unity ExecutionEngineException: Attempting to call method 'DGN.PRJX.Core.DialogManager`1[[DGN.PRJX.Game.UI.DialogID, DGN.PRJX, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null]]::.cctor' for which no ahead of time (AOT) code was generated.
2. 2021.05.20 20:44:57.038 12605 12663 Error Unity   at System.Reflection.MonoCMethod.InternalInvoke (System.Object obj, System.Object[] parameters) [0x00000] in <00000000000000000000000000000000>:0
3. 2021.05.20 20:44:57.038 12605 12663 Error Unity   at Zenject.ZenFactoryMethod.Invoke (System.Object[] args) [0x00000] in <00000000000000000000000000000000>:0
4. 2021.05.20 20:44:57.038 12605 12663 Error Unity   at Zenject.DiContainer.InstantiateInternal (System.Type concreteType, System.Boolean autoInject, System.Collections.Generic.List`1[T] extraArgs, Zenject.InjectContext context, System.Object concreteIdentifier) [0x00000] in <00000000000000000000000000000000>:0
5. 2021.05.20 20:44:57.038 12605 12663 Error Unity   at Zenject.TransientProvider.GetAllInstancesWithInjectSplit (Zenject.InjectContext context, System.Collections.Generic.List`1[T] args, System.Action& injectAction, System.Collections.Generic.List`1[T] buffer) [0x00000] in <00000000000000000000000000000000>:0
6.  

Dialogs manager class declared as

Code (CSharp):

1.     public class DialogManager<TEnum> : IDialogManager<TEnum>
2.         where TEnum : Enum
3. {
4. ...
5. }

and it is binded in Zenject installer as

Code (CSharp):

1. Container.BindInterfacesTo<DialogManager<DialogID>>().AsSingle();

where DialogID is Enum.

To run the build in Unity 2020.3 we had to create next method

Code (CSharp):

1. public void UsedOnlyForAOTCodeGeneration()
2.         {
3.             // IL2CPP needs only this line.
4.             new DialogManager<DialogID>();
5.  
6.             // Include an exception so we can be sure to know if this method is ever called.
7.             throw new InvalidOperationException("This method is used for AOT code generation only. Do not call it at runtime.");
8.         }

Something changed in Unity 2020.3, but we didn't find any release notes that described changes in IL2CPP generation.

 

Hi! Link for bug report https://fogbugz.unity3d.com/default.asp?1339728_koc78jg6htevea0c
Thanks