Weird Shading/sharpness on the model

[Kazrarr]

Hi

I got this weird shading on my model, so I just tried the usual stuff : recalculate normals, merge by distance, apply rotation and scale, flip normals on this two specific faces, deleting faces then rebuilding them, checking my modifiers, materials, nothing is doing it.

Any Ideas ?

(blender file included)
Hardsurface Helmet.blend (1.0 MB)

[Okidoki]

You do have (at least) one polygon which spans “inbetween”:

[Kazrarr]

Ah thank you, this was it… I feel dumb

[Okidoki]

You are welcome and this feeling feels familiar… and it will fade by time … i promise.