Good time of the day! I have the strange trail of the moving objects that stays on materials for a moment. There’s no such effect on the skybox, bsp or meshes I’ve imported with my custom materials. That is slightly on the landscape and most terrible on the water plane which you can see on the pic attached. Not sure when it appeared, I didn’t paid an attention to it. But for now I would like to remove it if it is possible.
P.S. I’m new in UE so sorry if this question is silly, but I really did my best 
Try turning your motion blur to 0 in your post processing volume.
Thank you for the advice, but it doesn’t help. I already tried to disable the volume at all. It must be something else.
Whoops - it’s SSR + temporal AA. If it’s absolutely necessary to disable temporal AA, go into your post processing volume, ensure its set to unbound, go to misc, tick AA and set it to FXAA or none.
Amazing! I would never think of it because I even didn’t notice the AA option. It had to be expanded in the Misc category. Thank you so much for help, it works!