Judging by the video it looks to me like you're seeing two different
framebuffers from the recent past. The reason nothing more recent is
replacing them and you see flicker is because the compositor thinks
Chrome has already opened over the top of the flickering window. So it
never gets updated.
*
** Attachment added: "Chrome open screen flicker.mp4"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/2092247/+attachment/5846358/+files/Chrome%20open%20screen%20flicker.mp4
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