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ac3c90dd75
Root cause: bonesDirty was a single bool shared across both double-buffered frame indices. When bones were copied to frame 0's SSBO and bonesDirty cleared, frame 1's newly-allocated SSBO would contain garbage/zeros and never get populated — causing animated M2 instances to flash invisible on alternating frames. Fix: Make bonesDirty per-frame-index (bool[2]) so each buffer independently tracks whether it needs bone data uploaded. When bones are recomputed, both indices are marked dirty. When uploaded during render, only the current frame index is cleared. New buffer allocations in prepareRender force their frame index dirty.