DeferredDecal has rendering issue on iphone

I uploaded a test project.

The issue can be reproduced at Iphone8(IOS 11) and Iphone6s(IOS 10.3.2).

1.Create a Material and set Material Domain to Deferred Decal.

2.Use a Translucent Texture ,and Connect Alpha to Opacity Channel.

3.Create a Decal Actor and use the Deferred Decal Material.

4.Build IOS version and deploy to Iphone8.

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