Sync /w won't delete in ftp folder

Sync /w seems not to be able to delete files when dir2 is a ftp folder. Is there a workaround or a fix? (ver 9.02.151)

I have attached an example of what happens, including ftp logs.

(I would have written it all in this this post, but the forum page complains that I have added 60 images to my message, although there are no images at all...!)

Peter Almer Frederiksen