Black flashing square on screen since latest update

Since the latest update that I got yesterday May 20th, I get random flashing black square on screen.

Not full screen. Always above the riders. But not always the same place according to my position.

On Pc. Windows 10 up to date.

Is this a know bug ? See pic. I was able to get a pic with the black square. Not easy at it flashes non stop.

See this thread

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