Same here on Vulcanus (my 2nd planet) running 2.0.21 experimental. Did got my briefing for Fulgora (which was my 1st planet)

Windowed mode worked for me as well but alternatively you can open the nvidia control panel, go to "manage 3d settings", select Factorio from the dropdown and look for the option "Monitor technology". Changing it to "Fixed refresh" solved my flickering issues (vsync on ...