2020.a14 breaks 3rd party editor dll

in Unity 2020.1a14 changelog:
..
Editor: Change the type of delayCall to event. (1193566)
..
this breaks many 3rd party editor plugins dll which doesn't provide source code.
because event type is not compatible with delegate type.

eg)

Code (csharp):

1.  
2. EditorApplication.delayCall += ()=>{};
3.  

this code compiles to dll like below.

- before a14

Code (csharp):

1.  
2. EditorApplication.delayCall = (EditorApplication.CallbackFunction)Delegate.Combine(EditorApplication.delayCall, new EditorApplication.CallbackFunction(delegate(){});
3.  

- after a14

Code (csharp):

1.  
2. EditorApplication.delayCall += delegate(){};
3.  

so, compiled dll before a14 is not compatible with a14.


is this confirmed breaking change?
if so, many editor plugins from Asset Store will be broken.

 

Do you have a plugin example that will be affected by this? We want to test it before applying a patch.

Thanks

 

Plugin with source code is not a problem.
but plugin with dll got an error.

For example,

Console Enhanced Free
https://assetstore.unity.com/packages/tools/utilities/console-enhanced-free-42381

Console Enhanced Pro
https://assetstore.unity.com/packages/tools/utilities/console-enhanced-pro-11521

this plguin emits error since 2020.1.a14.

Code (csharp):

1.  
2. System.MissingFieldException: Field 'UnityEditor.EditorApplication.delayCall' not found.
3.   at ConsoleE.InitModule..cctor () [0x0000d] in <c901d572ddfe48e086fb06681e2c9911>:0
4. UnityEditor.EditorAssemblies:ProcessInitializeOnLoadAttributes(Type[])
5.  

of course, doing "EditorApplication.delayCall =" is wrong usage.
but if you build dll with a code like "EditorApplication.delayCall += ()=>{}" before 2020.1.a14, and decompile it.
decompiled source shows
EditorApplication.delayCall = (EditorApplication.CallbackFunction)Delegate.Combine(EditorApplication.delayCall, new EditorApplication.CallbackFunction(()=>{}));
it is compiled not using += but using Delegate.Combine