Why has single pass stereo (double wide) been removed in the postprocessing stack v2? 2019.1+

We updated and now have two times the amount of drawcalls using frame debugger.

https://github.com/Unity-Technologies/PostProcessing/commit/872007bb1056b6f87a572ecb5e83fad61aa99dfa

Code (CSharp):

1. #if UNITY_2019_1_OR_NEWER
2.             if (context.stereoActive && context.numberOfEyes > 1 && context.stereoRenderingMode == PostProcessRenderContext.StereoRenderingMode.SinglePass)
3.             {
4.                 cmd.SetSinglePassStereo(SinglePassStereoMode.None);
5.                 cmd.DisableShaderKeyword("UNITY_SINGLE_PASS_STEREO");
6.             }
7. #endif