Change Button spriteState iOS exception \ bug

Hello!

I found a bug in unity which appears when you try to change Button's spriteState and set pressedSprite field programmatically.

The code below:

Code (CSharp):

1.  
2.  
3.     public Button btn;
4.     public Sprite imgPress;
5.  
6.     // Use this for initialization
7.     void Start () {
8.         SpriteState ss = btn.spriteState;
9.         ss.pressedSprite = imgPress;
10.         btn.spriteState = ss;
11.     }
12.  
13.  

causes an exception TypeInitializationException with 100% possibility on iOS (ver. 8.4.1, iPad2 64GB).

Works fine in editor though.

Did anybody face same problem ? Is there any known solution ? Should i report a bug to support?

Basically you just cant set pressed sprite from code if you using this:
Unity 5.5.0f3
all settings default except scripting backend - mono2x (only because it builds faster for test purposes)
test devices: iPad2 64GB or iPad mini 16GB
iOS: 8.4.1 or 10.0.2

Thanks!

Update1: there is no such exception if you use scripting backend - IL2CPP and Universal architecture, but its building sooooo long, you cant use it for testing in daily work, right ?

PS
zip with reproduce project in uploaded file
full exception stacktrace:

Code (CSharp):

1. ExecutionEngineException: Attempting to JIT compile method 'System.Collections.Generic.GenericEqualityComparer`1<UnityEngine.UI.SpriteState>:.ctor ()' while running with --aot-only.
2.  
3.   at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
4. Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
5.   at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
6.   at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
7.   at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] in <filename unknown>:0
8.   at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0
9.   at System.Activator.CreateInstance (System.Type type) [0x00000] in <filename unknown>:0
10.   at System.Collections.Generic.EqualityComparer`1[UnityEngine.UI.SpriteState]..cctor () [0x00000] in <filename unknown>:0
11. Rethrow as TypeInitializationException: An exception was thrown by the type initializer for System.Collections.Generic.EqualityComparer`1
12.   at UnityEngine.UI.SetPropertyUtility.SetStruct[SpriteState] (UnityEngine.UI.SpriteState& currentValue, SpriteState newValue) [0x00000] in <filename unknown>:0
13.   at UnityEngine.UI.Selectable.set_spriteState (SpriteState value) [0x00000] in <filename unknown>:0
14.   at TestBtn.Start () [0x00000] in <filename unknown>:0
15. (Filename:  Line: -1)
16.  
17. -> applicationWillResignActive()
18. -> applicationDidEnterBackground()
19.  

 

Hi,
I have the exact same problem however I cannot find SetPropertyUtility.cs. There is only a static class TMPro.SetPropertyUtility which uses currentValue.Equals(newValue).
I do not understand why I get

Code (CSharp):

1. Rethrow as TypeInitializationException: An exception was thrown by the type initializer for System.Collections.Generic.EqualityComparer`1
2.   at UnityEngine.UI.SetPropertyUtility.SetStruct[SpriteState] (UnityEngine.UI.SpriteState& currentValue, SpriteState newValue) [0x00000] in <filename unknown>:0

There is no UnityEngine.UI.SetPropertyUtility.