is not on disk yet as in STOR filename on one sessions starts, another session (set in ffxp to skip all) sends SIZE filename to know if the file exists at the same time, and gets File not found, so it do a STOR filename. 2 sessions are uploading the same file, overwriting each other.
You can reproduce by uploading a bunch of small files using 2 or more ffxp sessions, and reply skip all on overwrite prompt. You'll see what happens.
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