Weird glitch on mesh with shadow

Hi There,

I’m trying to solve a problem occuring with shadows.

I have these weird stuff happening on my mesh and I don’t know how to solve it.

Do you have a solution to fix that ?

Thank you very much

Sorry for not giving you a proper answer, but I believe this link could be of interest: ArtStation - Testing Lumen vs Raytraced scenes in Unreal 5