Irregular "dark" galaxy

https://www.legacysurvey.org//viewer/?ra=116.6424&dec=10.1035&layer=ls-dr9&zoom=16&ngc&sga-parent&sga&sdss-cat&const

Peculiar thing. Not known in SDSS.
There’s a similar one at 116.6694, 10.1203 - that one is designated as a galaxy.