BUG with last versions on Android and iOS

Hi, we have found a BUG:

On the bottom side of the screen and especially on the bottom-right side there are some artifacts.

The bug occur with iOS and Android.

The bug occur with Render mode "Direct ".

It works WELL on AIR SDK:  22, 23.

It works WRONG on AIR SDK:  24, 25, 26, 27.

Here is the Fla, apk, screenshoot and a video to test and see the BUG.

https://www.dropbox.com/sh/1vrmjw9w88rvagk/AADCdH0Opasgr2qcwhZqUtDWa?dl=0

Screenshoot of the BUG:

Thanks for your help.