Layout Group in Unity 5.3

After update to 5.3 issue was happen when orientation change. It appears on iOS and Android, but not in Editor.
I have some window with layout group:

Behaviour on device:

What could be the problem?

P.S. I could not repeat this behavior in an empty project, and for obvious reasons I can not give this project. So here I decided to turn instead to make a bug report.

 

If you can't replicate in a test project, it's going to be tough for Unity to look at.
But it is very concerning you are seeing differences between platforms.

One suggestion is to close your project, delete your Library / Temp / Obj folders (clearing out the cached elements)
And also build a brand new platform project for each instead of updating the existing one, to see if it's some weird upgrade issue.

Other than that, you're going to need to replicate it to make any progress.

 

I replicate it. Even in the editor.
In console:
Trying to add (Layout Rebuilder for) Content (UnityEngine.RectTransform) for layout rebuild while we are already inside a layout rebuild loop. This is not supported.
UnityEngine.Canvas:SendWillRenderCanvases()

Test scene in attach. This is known bug or I need report this?

 

I'd report it using the unity bug reporter in the editor and see what they say. They are usually fairly quick in responding, especially after a release.

 

Case 753089

 

Is there some of progress with this bug?

 

That bug has been fixed but not sure when it will be public. He have a huge list of changes we are trying to get into a patch but its taking time due to the holidays. If you need a fix quickly you can do download the 5.3 source and remove the offending line you will see no ill effects.

 

Which line? We don't get details on internal errors.