fish completions break tab-completion of files/folders

[beaumccartney]

Describe the bug
Sourcing the completion script in fish allows me to tab-complete gum subcommands but then I can't complete files or directories after.

To Reproduce
Steps to reproduce the behavior:

1. install gum
2. start fish and source gum completions
3. mkdir mydir && touch mydir/foo && touch mydir/bar
4. gum choose my<TAB>
5. mydir won't complete

Expected behavior
Tab completes mydir. Tried this in zsh and it works fine

Screenshots
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Desktop (please complete the following information):

• OS: MacOS 14.4.1

Additional context
I've observed this behaviour also with freeze and glow. I've tried installing from homebrew and go installing and reproduced the behaviour in both cases.