Stripes in layover shadow mask

Hello all,

I just stumbled upon these stripes in the layover shadow mask at the northern boundary of a processed scene. There are other areas along the boundary, but nothing futher in the scene. I reckon that only the first burst seems to be affected.

The stripes are also exactly the same when I process the scene with SRTM 1Sec HGT, Copernicus GLO-30 or an external DEM (Copernicus EEA-10).

The scene I processed was S1A_IW_SLC__1SDV_20210514T171503_20210514T171530_037887_0478B1_3294