[Bug 276419] x11-wm/xfce4-panel: 4.18.5_2 artifacts in XFCE panel like blinking objects and random pixels

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276419

            Bug ID: 276419
           Summary: x11-wm/xfce4-panel: 4.18.5_2 artifacts in XFCE panel
                    like blinking objects and random pixels
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: xfce@FreeBSD.org
          Reporter: p5B2EA84B3@t-online.de
          Assignee: xfce@FreeBSD.org
             Flags: maintainer-feedback?(xfce@FreeBSD.org)

Mouse hovering restores normal appearance but only temporary.

What causes this artifacts and why is only the panel affected?

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