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points

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Just type <enter> without cat, your shell will show you another prompt, and the ssh escape command will also work.

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No they are correct, fish seems to intercept this or something like that. Only works with cat.

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In newer versions, it's disabled by default and you have to do something like this to enable in ~/.ssh/config:

    Host *
    EnableEscapeCommandline yes

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`EnableEscapeCommandline` only controls the <Enter>~C commandline.

The reason that is disabled in current OpenSSH by default is OpenBSD `pledge` support:

On my Linux,

    cat<Enter>~.

closes the connection as expected, and no ~ is shown in the terminal.