fc29 openssh : can't disable StrictHostKeyChecking

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ssh -o stricthostkeychecking=no works.

There's no ~/.ssh/config

grep Strict /etc/ssh/ssh_config
#   StrictHostKeyChecking ask

but it doesn't ask:

ssh new-gateway
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:TylFZRyv2D0miW94XagWwZOFPPCd1PhTRscDSXZHwVw.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /root/.ssh/known_hosts:1
ECDSA host key for [new-gateway]:6878 has changed and you have requested strict checking.
Host key verification failed.

though it reads the config file correctly:

ssh -G  new-gateway | grep strict
stricthostkeychecking ask

I don't want to change the ECDSA host key, because sometimes that machine is at this address.

any help appreciated
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