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GL_STENCIL_INDEX8 becomes a first-class internal format (VK_FORMAT_S8_UINT backing, metrics, classifiers, converters), so glRenderbufferStorage accepts it instead of leaving GL_INVALID_ENUM behind. Framebuffer completeness now also mirrors the renderer's gate for renderbuffers: distinct depth/stencil renderbuffer attachments (or a renderbuffer paired with a texture) report GL_FRAMEBUFFER_UNSUPPORTED - the spec only requires the same-image case - instead of passing completeness and then failing at draw/clear (verify_mixed_attachments.* now passes).