Block-Corner with Decals has weird AA

Put a decal with a transparent backrgound on a block and you’ll see that the edges are jagged. There’s a comparison below with no decals and it’s smooth.

See steps to report a bug here, there’s more info that could be added:
Please Read Before Posting: Steps to Report a Bug

EDIT: By the way, I’m seeing a similar artifact without any decals:

If you remove the decals is the effect still there?

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mhm, looks like ambient occlusion may be causing it.

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It is definitely the ambient occlusion. Someone noticed this the day MSAA went live, actually.

Oh, I was having this problem with a union and thought it was a CSG issue. Good to know what it is