Every time I use my ultimate as Juno, it causes intense flashing to last the entire duration of the ult. I can barely look at the screen when this happens. It seems to only be happening with the Heart of Hope Mythic skin equipped, at least for me. (Shown here: https://youtu.be/1etOlPyQFPs?si=u0jAtbIgK5pCzHZ5 ) It should also show it happening in this replay: 1C8C6C
Edit: I have also seen this happen from enemy ults of Bastion and Ramattra.