Glitchy 3D UMG Widget when using canvas clipping parameters on ES2 & ES3.1

Am I doing something wrong, or when I try to follow the Unreal Docs for creating 3D Widgets https://docs.unrealengine.com/latest/INT/Engine/UMG/HowTo/Create3DWidgets/index.html ) and then when trying to apply some CanvasPanel clipping option the whole thing goes buggy.

The screenshots explain by themselves

The UI Widget:

The glitch occuring on the map editor:

On the preview window

Here on my iPad Air (iOS 11.2.5) when not facing the 3D Widget

And then when the viewport faces the 3D Widget:

Also worth mentioning that this black clipping area also resizes acording to the canvaspanel size.

Basically the steps to reproduce are: Create new project > follow the 3d widget tutorial > try to enable clipping on some canvaspanel > run it on ES2 ou ES3.1 as preview or on device itself

running on mac os 10.13.3 + xcode 9.2 + unreal 4.18.3 installed from epic launcher

So, any clues? Am I missing something?

Thanks!

Just for the sake of it, tested on 4.19 preview 5, same issue

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks

From a Staff standpoint, does this looks like a real bug? I’ll be reporting it in if so.
Thanks for the support!