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Thanks for reproducing the issue and identifying the source. Hopefully, it will be relatively straightforward to address.

I found narrow coherence-loss seams along whole-degree meridians in interferograms generated from NISAR L-band GSLCs over Alaska using the polar stereographic projection (EPSG:3413). For one GSLC pair (Track 121 / Frame 33, 2026-07-04–2026-07-16), the seams coincide with approximately −147°, −148°, ...