Fedora 35 with openssh-8.7p1-3.fc35.x86_64

When I run ssh like so connecting to a range of other Linux machines:

ssh -l root <remote host> "set -x; pwd; exit"
/root
+ pwd
+ exit

or

ssh -t -l root <remote host> "set -x; pwd; exit"
+ pwd
/root
+ exit

or

ssh -tt -l root <remote host> "set -x; pwd; exit"
+ pwd
/root
+ exit

It will never (I have let it go about ten minutes) actually exit ssh. When I 
ssh with no command, I
get the bash prompt and when I type exit<nl>, it will exit ssh and return to 
the local bash prompt
after around four seconds. It doesn't matter what user I connect as, that 
doesn't affect the hang.
When I do the same back to my f35 machine, I don't get a hang and it returns to 
the local bash
prompt immediately when I exit from an interactive session.

I'm using public key auth in all cases, the remote machines are derivitives of 
RHEL 6,7,8 running in
AWS and sometimes across a VPN and sometimes not.

Can anybody suggest what is causing the hang and how to avoid it?
Thanks
Linus
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