Version: 4.0.2
Operating systems and terminals: reproduced on Linux w/ Ghostty, Linux w/ GNOME Console, Darwin w/ iTerm2, Darwin w/ Terminal.app
Reproduced without third-party customizations: yes

Problem:

Typing or pasting the following text into fish will cause it to crash immediately after inputting the last character ("):

"
$()"$() "

thread 'main' panicked at src/parse_util.rs:956:33:
index out of bounds
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
fish crashed, please report a bug. Debug PID 12353 or press Enter to exit