ProxyJump does not accept IPv6 for the intermediate host?

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Hello,

it seems I cannot use:

$ ssh -J root@2a01:4f8:1c1e:528d::1 root@west-coast
Invalid -J argument

(The west-coast is stored on the jump host in between in /etc/hosts.)

$ ssh -J root@167.235.141.44 root@west-coast

Works as expected. Also 

$ ssh root@2a01:4f8:1c1e:528d::1

does work as expected. I do have native IPv6.

This is on Debian 12 Bookworm:
$ ssh -V
OpenSSH_9.2p1 Debian-2+deb12u2, OpenSSL 3.0.11 19 Sep 2023

The workaround seems to be to define the host used in ProxyJump in
~/.ssh/config then it works with IPv6 too.

Yes, I known I should use IPv6 with DNS which is not the point here.

What have I overlooked?

Thank you for any help.

Adam Kalisz
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