Unreal Engine / Meta Human Shadows Rendering problem?!

Does anyone know why those pharmacies appear under the chin? As can be seen at Lod 2, the problem disappears, but I would prefer to keep the character at maximum Lod 1 because I will use it as a ThirdPersonCharacter. If anyone knows a solution. Thanks!

The link with the problem.

Link:Unreal engine / metahuman problem - YouTube