@gamebuilders your solution really solve draw batch problem! thank you so much

However after i changed SkeletonSprite.as, when i test goblin-ffd spine animation, i cant spawn many skeletons (tried 10 animations)

I got RangeError: Error #3669: Bad input (at flash.display3D::VertexBuffer3D/uploadFromVector() )

Digging deeper, it seems PolygonBatch.as buffers may be the culprit