FTPS Sync always "complete with errors" - "Unexpected size of data stream"

[BrainPain]

Hi, i am testing now Freefilesync 10.8 under Window 2008 to sync files up to an ftp server using ftps (selfmade keys).
Im using the "File time and size" comparison, ignore errors, "Mirror->" Synchronization, permanent delete

I got for any file it uploads the same error Message

Error Cannot read file "D:\!oe1\xxx\xxx_30.01.2019.mp3".
Unexpected size of data stream.
Expected: 59200704 bytes
Actual: 58698336 bytes [notifyUnbufferedIO]
Cannot read file "D:\!oe1\xxx\xxx_31.01.2019.mp3".
Unexpected size of data stream.
Expected: 59200704 bytes
Actual: 58894944 bytes [notifyUnbufferedIO]

interestingly the filesizes do not nearly fit withe the original size of the source files - for example
xxx_30.01.2019.mp3 is 29.600.352 Bytes (or the real size in using whole clusters - 29.601.792 Bytes)
compared to the 59200704 bytes Freefilesync reads somewhere...?!?!?

The upload is functioning only when i disable "Fail-save file copy" - otherwise i get on the destination only "xxx.ffs_tmp"-files in the size of the original file.

Any ideas?

[Zenju]

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