Seen this a few times. It's rare and I cannot reproduce it. Currently on 13.8 (Windows 10) but I've seen it on earlier v.13 versions, too. This particular operation is FTP to local copy/download. Can't say if FTP is related.
This kinda look like what was reported here : Occasional graphical corruption on copy window
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Thanks. The graph was already disabled. I'll try the 2d setting.