i’m creating a video and had this bug few times
if i change one material, then in sequencer after about 2 seconds of rendering all materials becomes reduced (a kind of lower level of details). it needs to rebuild all lightings that gets about 3hrs in my case. but in fact all those materials are well-looking in preview window
and what i’ve discovered just now that if i restart UEditor → it renders better, but not best still.
Sequencer must render everything not depending on prebuilt lighting (while of course it should use it), but it’s own rendering engine must collect all data on the fly and build everything in camera viewport (maybe some other render-mode).