I believe (though cannot confirm as of yet) that this is an issue with one of the several new bugs introduced in 4.25 with Auto Exposure. They drastically changed the way Eye Adaptation is calculated, but it also caused new bugs/issues.
Turn off Auto Exposure in the project settings for now until this issue is remedied, you don’t really need it for production until final launch anyways. Remember to set the Auto Exposure Bias to 0 (default is 1) as well, because there is a glitch there currently. Also, turn off eye adaptation in the editor window or else there may be a disconnect between in-game view and your editor view. Hopefully this can remedy the issue for you as it did for me, at least for now.