What is it?

http://www.legacysurvey.org/viewer?ra=184.5384&dec=-1.2491&zoom=15&layer=decals-dr5

This is a little glint feature. I think it comes from scattered light in the camera. In the blue and green bands it gets detected and masked out, but in the red only the center gets removed, by accident. Before getting masked out it looks like this:

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