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banner_patterns.png-atlas in Java Edition 1.16.5 and 21w17a.
banner_patterns.png-atlas is a procedurally-generated texture atlas used to store textures for all banner patterns.
banner_patterns.png-atlas is a fixed-width 512 × 512-pixel file that store textures for all banner patterns.
Textures of banner patterns in item form and banner itself is stored in blocks.png-atlas.