text: Title: Wan2.1 result is black, when using --use-sage-attention and setting weight_dtype to fp8_e4m3fn.
  Body: When using --use-sage-attention and setting weight_dtype to fp8_e4m3fn, the result is black, 
  
  Using --use-sage-attention, --force-upcast-attention and setting weight_dtype to fp8_e4m3fn, the result is still black.