Root Viewports shadow atlas interferes with other Viewports shadow atlas?

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:bust_in_silhouette: Asked By mneg

Why do the shadow atlas settings of the project (Rendering → Quality → Shadow Atlas) interfere with the same settings of other Viewports? Basically I am trying to disable the root Viewports shadow atlas as I extensively use other Viewports as render targets which calculate the shadows themselves. However, disabling the global shadow atlas results in very blocky shadows within the other Viewports, regardless of their specific settings.