Picom flickering on nvidia

Why with picom, windows can start flickering, until the part of the screen is forced to redraw? (by hovering over with cursor, i3 windows layout update, etc)
Nvidia rtx 2700 Super, proprietary drivers 460.39
picom visible in htop and it’s config at ~/.config/picom.conf has:
backend = "glx"
xrender-sync-fence = true
vsync = true

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