I used fog of war plugin on ios but no visible view showed. I create a new project with simple mat show the bug again.
the first image is it works on pc,
the second one is on ios preview.
the mat implementation as that
I upload the .usset file and the .Copy file, I wonder which will work corrently on your project, obviously it used Starter Content.
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I this the World Position Node cause this bug, I know it fixed in normal mat on 4.13, but maybe Post process material has this problem also.
Fog of War system is nessery for my project, I hope it will be fixed soon or you can tell me a way another.
DesperateZero with greatful