Problem with Nautilus and Port 22 when a different port is configured

I've configured my ssh client(s) to use a port different from 22, in order to avoid the large number of break-in attempts on the standard port 22. That's the "Port" setting in /etc/ssh/ssh_config. I've also configured my ssh servers (different machines) to use that port. That's also "Port", in /etc/ssh/sshd_config. This works fine.

But now I'm trying to use nautilus to connect via sftp to my website, using the address:

sftp://username@provider:22/path/to/www/data

The port 22, which is to be used, is provided. The configured new default port is overridden by it. This works for the sftp command:

sftp sftp://username@provider:22/path/to/www/data

But it doesn't work with nautilus. I get this message (translated back from German to English):

"The server has refused the connection. This usually is because of a firewall denies access or the remote service isn't running."

But when I change the default port in /etc/ssh/ssh_config back to 22, it works!

It looks like nautilus fails to regard the port, which is provided in the URL (see above).

Ubuntu version: 20.04.1 LTS
Nautilus version: 1:3.36.3-0ubuntu1

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: nautilus 1:3.36.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-47.51-generic 5.4.55
Uname: Linux 5.4.0-47-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Sun Sep 20 17:52:29 2020
InstallationDate: Installed on 2020-08-03 (48 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_nautilus: