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…al up/down blocks `WanResidualDownBlock`/`WanResidualUpBlock` (and the QwenImage21 copies) clone the block input before running the main path, only to feed it to the `avg_shortcut` branch. Nothing in the main path writes to its input in place, so the clone just holds an extra activation-sized buffer alive for the whole block. Alias it instead. Outputs are bitwise identical; peak activation memory drops by ~10%.
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