Cannot login by Server URL if password contain "+"

Everytime if I try to log on to FTP server by URL looks like ftp://username:pass@hostname/, I always have to specify password again if the password contains +.
I am not sure what happened if the username contains +, but I think the issue will be the same as I understand + is understood as space in URL encoding.

Is there anyway to fix it?
Thank you!

URL-encode the + as %2B:
https://winscp.net/eng/docs/session_url#special