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A CMASK holds 4 KiB per 1024x512-pixel metablock, not one nibble per 8x8 tile of the target: 1920x1080 spans 0x6000 bytes, as titles clear it, not 16200. The swizzled nibbles of the lower-right tiles lie past the packed size, so the fast-clear check missed them and the expanded store left them cleared. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>