fnm use system breaks node

[andyhasit]

Already have node installed.
Installed fnm via curl on Linux Mint 22, went into dir with .nvmrc file, was able to set version.

Expected nvm use system to point node back to system node, but instead it breaks the node command until I point it back to an installed version:

andrew@mint:/code/np-front$ cat .nvmrc 
20.17.0
andrew@mint:/code/np-front$ fnm use
Using Node v20.17.0
andrew@mint:/code/np-front$ fnm list
* v20.17.0 default
* system
andrew@mint:/code/np-front$ fnm use system
Bypassing fnm: using system node
andrew@mint:/code/np-front$ node --version
bash: /run/user/1000/fnm_multishells/361513_1730982949486/bin/node: Not a directory
andrew@mint:/code/np-front$ fnm use
Using Node v20.17.0
andrew@mint:/code/np-front$ node --version
v20.17.0
andrew@mint:/code/np-front$ 

I could get round this by installing the system version using fnm, but this is still unexpected behaviour that breaks all my other projects.