Unreal Engine Issues and Bug Tracker (UE-190018)

Description

This appears to be coming from the ResolveSceneColor pass.

Steps to Reproduce

Download the repro project: [Link Removed]
Open the material M_Gradient, and observe its translucency.
Observe that the material blend mode is Masked.
In the Project settings, change the Anti-Aliasing mode to anything besides Multisample
AA. The material will then be visibly masked instead of translucent.

There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-190018 in the post.

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By Design

Component	UE - Rendering Architecture
Affects Versions	5.2.1

Masked material MSAA bug