I ran into this as well and found the workaround, but hadn't yet gotten around 
to analyzing the exact situation as thoroughly as you have.  I'll open a case 
and see what they say.  Thanks.

On Wed, Jan 15, 2020 at 02:03:22PM +0100, Tore Anderson wrote:
> Note the addition of [email protected] and [email protected]. These 
> are advertised by 12.3R12-S13.1 as well.
> 
> The Fedora OpenSSH client will use [email protected] by default when 
> supported by the server, and this fails with the above error message. So does 
> [email protected].
> 
> Explicitly selecting another cipher works, e.g.:
> 
> ssh -o [email protected] <switch>
> 
> Didn't find any KB article about this issue, so I thought I'd post here in 
> case any Juniper employee would like to report it internally, as I'm guessing 
> others will run into the same issue eventually. (My old switches are long out 
> of support, so I can't open a JTAC case.)
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