I uploaded a test project.

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

Steps to Reproduce

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.

Have Comments or More Details?

There's no existing public thread on this issue, so head over toAnswerHub just mention UE-55980 in the post.

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ComponentPlatform - Mobile
Target Fix4.23
CreatedMar 9, 2018
ResolvedMar 4, 2019
UpdatedSep 16, 2019