It slipped my mind but i also noticed an issue with the epic hud controller too which i have yet to report. This could be connected.
When you have the hud controller to not show things or even turn off the hud in a session it doesnt always respect the settings. Also i had this white image thing on another map and i did report via this forum. I don’t think it happens on a published version as i published my map regardless and i never seen the white box in the published version.