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:
How to post a Bug Report
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