ComfyUI removed the `flipped_img_txt` attribute from `DoubleStreamBlock` in a recent refactor (commit e1add563f, "Use torch RMSNorm for flux models and refactor hunyuan video code"). This causes an AttributeError when IPAdapter Flux nodes are executed. Use `getattr` with a default of `False` (matching the original default) to maintain compatibility with both old and new ComfyUI versions.