Possible lensing....a smaller arc-like feature (with same colouration) appears in close proximity

https://www.legacysurvey.org//viewer/?ra=355.2626&dec=-57.3428&layer=ls-dr9&zoom=15&const

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Looks more like a Voorwerp candidate to me

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No W3/W4 and radio signature unfortunately.

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Imo background galaxy or material form that galaxy