Could this be a voorwerp?

The galaxy has an AGN, and this fuzzy, dim green streak is nearby.

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DR3 gives a better view:

No voorwerp for me. Likely a background galaxy.

What is DR3?

The 3rd data release of HSC. The image you posted is from their 2nd data release.

I don’t see DR3 in the viewer

It’s not in the viewer yet.