This is not a solution, as in Unreal engine 4 I had no such problems when using movable mode.
The only way I found that doesn’t solve the problem but hides it, I change my skylight settings to (SkyLight > Distance Field Ambient Occlison > Min Occlusion = 1). And the shadows become less they stop flickering, but then there are artifacts when you look closely, I showed in the screenshot below
