SetRenderTarget problem

Hi, I'm working on a post effect

and for that i need to render set of meshes to texture with ZTest LEqual to create a mask

here is a sphere rendered to separate texture

so i'm creating new RenderTexture and setting it as active color buffer while leaving depth buffer unchanged
rendering what i need and resetting render target

and everything works perfect

but when i'm enabling Direct3D in player settings and enabling anti-aliasing in quality settings
i'm getting an error:

here is my code:

Code (CSharp):

1. void OnRenderImageTest0(RenderTexture source, RenderTexture destination){
2.         // create new render target
3.         RenderTexture rt = RenderTexture.GetTemporary(_camera.pixelWidth, _camera.pixelHeight);
4.         rt.Create();
5.         RenderBuffer tmp = Graphics.activeColorBuffer;
6.  
7.         // change render target
8.         Graphics.SetRenderTarget(rt.colorBuffer, Graphics.activeDepthBuffer);
9.  
10.         ...
11.         // render meshes
12.         ...
13.  
14.         // reset render target
15.         Graphics.SetRenderTarget(tmp, Graphics.activeDepthBuffer);
16.         rt.Release();
17.     }
18.  

is it a bug or i'm doing something wrong?
is there any way to do that on Direct3D with enabled anti-aliasing?

 

here i've found that

But in my case size is equal.

unity documentation says:
https://docs.unity3d.com/Manual/SL-CameraDepthTexture.html

ok, I have ZWrite Off

more from docs:
https://docs.unity3d.com/Manual/SL-PlatformDifferences.html

this is clear, but what i can do in my case?