Custom Depth Stencil Write Mask not work on Mobile

Development Rendering
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1

Custom Depth Stencil works but the value not masked by Custom Depth Stencil Write Mask.

On IOS preview the value is 255, so the sigt is dark and poison feild full screen.

224483-ios.jpg

On PC the sight value masked first bit is 1, the poison field value masked second bit is 2, the overlap area is 3

224484-pc.jpg
224484-pc.jpg963×565 59.7 KB

this is the second render bug on mobile, will next verison fix them or wish fixed them?

2

it seems stencil buffer can not be sampled on mobile,so unreal uses a regular buffer to store stencil for mobile,regular buffer do not support write mask.I might be wrong though.