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The memory leak happens because `ED_node_link_insert` (called after the transform operation) overwrites the pre-existing `snode->runtime->iofsd`, losing the reference without freeing the memory. So to "move" the reference from `snode->runtime->iofsd` to `op->customdata`, so that each operator works with its own data. Reviewed By: Severin Differential Revision: https://developer.blender.org/D15948