UMG element with material does not receive gamma correction on mobile

Engine Version: 4.7.5

Mobile Preview/Device: HDR off, both Android and iOS


See this issue first.

The post above was made regarding gamma correction for UI elements. We noticed it got fixed for images, but still happens for materials on mobile. We are solving it ourselves by adding a gamma correction hack in our UI materials by doing this through feature level switch:

pow(Texture.rgb, 2.2)

We have the impression that all materials on mobile are not being gamma corrected, as some materials become noticeably darker or lighter than the original.

we have same problem here. And this is not fixed at 4.8.2