Any export of static picture larger than 1920x1080 will lead to an overbright the render.
The same problem applies to video exports (at 1920x1080 too): The exposure shifts during the rendered sequence. Lowering the sun value and using autoexposure is not a fix.
It has now been months, please make it a priority. Twinmotion It is effectively unusable because one can not export the scene.
Thanks