kill-line not working in interactive mode

[n8henrie]

Is there a way to get ctrl u to clear the current line in command / interactive mode?

Minimal example for reproduction:

1. Run sk
2. In the prompt, type asdf
3. Type ctrl u and note that the asdf is cleared
4. Hit ctrl q to enter command / interactive mode
5. Type asdf
6. Type ctrl u and note that nothing happens

Seeing this behavior on MacOS Catalina, installed via homebrew, and on Arch Linux, installed with pacman. --bind ctrl-u:kill-line doesn't seem to help.