As I was writing my earlier note I started to suspect the SSH portion of that and verified that too.
Indeed it is "part of the issue". it is an SSH client side operation whereby the right "escape" sequence needs to be defined, configured and used.
Thsi is not pertaining to IOS, or XR, but merely a client signaling operation as to how this escape is presented with a special SSH control character to the server (eg XR).
Maybe this helps:
Escape sequence for IOS ssh is "ctrl shift 6 x" but for other clients,
this might not be the case.
You might want to check the ssh_config file, at /etc/ssh/ssh_config, and
in your ~/.ssh/ssh_config file, to see, what's the escape sequence
there. Most commonly, this sequence is "~".
You may also get some juice out of setting the escape character to something more simple for testing like this:
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