Looks to me like you’ve disabled anti aliasing. TAA/TSR and other forms of temporal anti aliasing are used to temporally supersample certain high end or expensive visual effects, so they can be performed at a lower resolution for improved performance.
This often manifests as noisy artifacts if you disable the temporal accumulation.
You’ll either need to turn on TAA or some similar tool, or disable or change whatever feature is relying on the temporal effect. It appears to be ambient occlusion of some kind.
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