I suppose you could try this part of the fix to see if it helps. If not, wait for help from dev.
There are lots of other options you can try, but I can’t give further guesses on first to try.
FTP area required some revision, and I wasn’t who did that. I hope you can wait awhile.
Are you good with network tracing or server logs ? If you downgrade, info first may help.
If you can get a port 21 trace, be sure not to accidentally post your credentials to forum.