Issue with BitmapData draw on HTML (Lime 7.6.3 + OpenFL 8.9.5)

Hi,
I have a custom Image9Slice implementation that was running properly on Lime 7.5.0 + OpenFL 8.9.1, but after upgrading to Lime 7.6.3 + OpenFL 8.9.5 isn’t working properly on HTML target.
The issue is present in WebGL and also on Canvas build.
I’ve attached snapshots and here is the link with the project to test the issue.
Thanks,
Adrian.