Artifacts on my actor

Hello everyone, I have a problem with the fact that it is not clear artifacts on the bottom of my moving actor, an example in the video. Please tell me what to do to fix this

Fine guys, recantly i returned to Unreal and sloved this problem,So the slove of this problem is turn off the Lumen and recreate all Light resources,yeah Lumn is broken and we still need to waid,unfortunately this is the only slove of this problem :smiling_face_with_tear:

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