Bash completion suggests multiple instances for single-instance commands

[ricab]

$ multipass shell [TAB][TAB]
aspirant-ermine  --help           luscious-elf     --verbose
$ multipass shell aspirant-ermine [TAB]
--help           luscious-elf     --verbose

But shell only accepts one instance... Other commands are affected too.

Expected behavior No instances would be suggested after the first free argument. In shell or snapshot, free arguments could be identified by whether or not they start with a dash. In exec or mount, it is a little trickier.