Same here, it stared in Chrome maybe a week ago but now it also affects Chromium.
In addition to that opening a new window results in a window that does not update its content, there is just snapshot of whatever was on the screen below the window. Usually maximize/restore fixes it.
Ubuntu 20.04 kernel 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Chromium 86.0.4240.75 snap
Google Chrome 86.0.4240.75
Intel Corporation Iris Plus Graphics 655, using xorg 'intel' driver, using xorg because Wayland crashes on my system.
Same here, it stared in Chrome maybe a week ago but now it also affects Chromium.
In addition to that opening a new window results in a window that does not update its content, there is just snapshot of whatever was on the screen below the window. Usually maximize/restore fixes it.
Ubuntu 20.04 kernel 5.4.0-52-generic #57-Ubuntu SMP Thu Oct 15 10:57:00 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Chromium 86.0.4240.75 snap
Google Chrome 86.0.4240.75
Intel Corporation Iris Plus Graphics 655, using xorg 'intel' driver, using xorg because Wayland crashes on my system.