Batch processing bug -- saves to worng format

[heepo]

I used batch processing to edit my PNG files and choose TIFF as output format. However, the output files was always saved to JPEG.

[heepo]

Additional :
I've recheck again and found that the bug occur when I load a script (I not use script, just need some of my preset commands appear on the transformation list). The script originally save to PNG but I unchecked the script and manually assign to have TIFF output. Therefore, the bug not occur if I manually config the transformation list.

[xnview]

I can't reproduce, do you have a way?