Confirmed adding entry to .ssh/config solved it for me.
My example for each old host:
Host x.x.x.x
HostkeyAlgorithms +ssh-rsa
PubkeyAcceptedAlgorithms +ssh-rsa
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https://bugs.launchpad.net/bugs/1971158
Title:
ssh connect to server stop on "SSH2_MSG_KEXINIT sent"
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