[BUG] kak -p doesn't work.

### Version of Kakoune 2025.06.03 ### Reproducer Run `echo 'info test' | kak -p $kak_session`, where kak_session is properly set to a session id of a kakoune running with `-n`. ### Outcome It does nothing. ### Expectations The command passed to the stdin should be executed in the given session. ### Additional information I'm using Guix System. The issue occurs both in foot and alacritty.