Installed keyboard displaying big black bar in Whatsapp

L.S.
I was advised to post an issue here where the installed keyboard when flipped horizontally and vertically starts displaying a big black bar (see image.

Darcy believes that if KAB could use the latest KMEA engine :
https://downloads.keyman.com/android/stable/13.0.6214/keyman-engine-android-13.0.6214.zip that this might solve the problem.

Any help would be appreciated since we hope to release the keyboard soon and its main usage will be with Whatsapp.