xfwm4 shows staircase screen with amd Raven2 graphics

[Derk Willem te Bokkel]

This happens under xubuntu and lubuntu (if using xfwm4 as window manager instead of openbox)
with the latest update xfwm4-4.14.1-0ubuntu1 ..
previoius version had no issues..

first happened under xubuntu installed lubuntu to determine if graphic driver was the issue but problem did not appear using openbox as window manager .. when i switched to using xfwm4 under lubuntu the same issue seen under xubuntu appeared ..

I will upload a screen shot later if possible

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xfwm4 4.14.1-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Uname: Linux 5.4.0-24-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Thu Apr 16 13:05:04 2020
InstallationDate: Installed on 2019-12-02 (136 days ago)
InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20191130)
SourcePackage: xfwm4
UpgradeStatus: No upgrade log present (probably fresh install)

[Derk Willem te Bokkel (dtebokkel)]

Processor : AMD Ryzen 3 3200U with Radeon Vega Mobile Gfx
Memory : 10112MB (985MB used)
-Display-
Resolution : 1600x900 pixels
OpenGL Renderer : AMD RAVEN2 (DRM 3.35.0, 5.4.0-24-generic, LLVM 9.0.1)
X11 Vendor : The X.Org Foundation

[Derk Willem te Bokkel (dtebokkel)]

note when booting through recovery mode and then starting xubuntu the user screen is normal no staircasing.. (different graphic driver)