What is causing these rectangular artifacts when I try to denoise in LRC?

What is causing these rectangular artifacts when I try to denoise in LRC? https://preview.redd.it/xncjhvk554ad1.jpg?width=1080&format=pjpg&auto=webp&s=32343ea75aa700c9f74e73683ff04e6964cf9d1d First time trying astro. Learned several lessons about what I'd do differently. This was shot on Fuji XT1 and the xf 10-24 f4. Shot at 10mm; iso 200; f4; 30 seconds. Denoise was only set to 15/100.
submitted by /u/uncle_b...

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