Iv been messing with the camera setup in the latest build and managed to reproduce the bloom with the 3rd person template with the new player, using the same blueprint setup as the 3rd person from beta 3 will cause the same effect to happen, my guess is theres something wrong with the camera actor and the per pixel lighting when the screen is under a set width and/or height or something like that.
this is my guess because if you set the aspect ratio to something below around 1.4 on the camera actor, the bloom doesn’t overpower the screen,
I couldn’t tell, but i think the bloom is scaling depending on the aspect ratio, i think around 1.48 the bloom would creep in, but only slightly.