[Bug] Ftp client fails for elements with '[' in their path

On ftp (connecting to an external server where the app is a client), files and folders containing the character '[' horribly misbehave in various ways. Trying to rename or delete such an element will kill the connection to the ftp server entirely, making every folder show as empty until the app is restarted. When creating or renaming a normal folder to one containing [, I got an apparent infinite loop where the folder contained itself (see attached image). All folders with [ in their name show as empty but don't otherwise break the connection.
There is probably more weird behavior but I figured it is likely a single fundamental issue percolating up from the protocol layer.