UnLit materials are not masked out on mobile deferred lighting pass with depth prepass enabled

It couldn't be noticed on the screen but it could be viewed in Renderdoc.

1. Create a project from ThirdPersonTemplate.
2. Set r.Mobile.ShadingPath=1 and r.Mobile.AmbientOcclusion=True in the defaultengine.ini, restart the editor
3. Create an unlit material(non-masked) and assign it to a cube in the scene.
4. Capture a frame with Renderdoc, the unlit cube is not masked by the stencil test.

[Image Removed]

[Image Removed]