“Unknown command” upon mosh login

I can log in using SSH from Blink and both SSH and Mosh from Termius, but not Mosh from Blink.
It looks like it’s trying to execute the IP address as a command instead of mosh-server.

Transcript with redacted IP address below:

```
blink> mosh gc_tokyo
fish: Unknown command 'XXX.XXX.XXX.XXX new -s -c 256 -l LC_ALL=en_US.UTF-8'
fish: "XXX.XXX.XXX.XXX" new -s -c 256 -l LC_ALL=en_US.UTF-8
^
Did not find remote IP address
blink>
```

The about page doesn’t list version information, but this is with Blink from the App Store this morning.