Tmux split window does NOT use current directory after installation of fish release 3.

I tried setting the following from fish to bash, but the issue is the same. I don't know anything about the underlying connection of fish and tmux. However, this issue occured right after the installation of fish release 3.

set -g default-command /usr/bin/fish
set -g default-shell /usr/bin/fish

The relevant tmux config lines:

# Splitting to current directory instead of home dir
bind-key -r \ split-window -h -c "#{pane_current_path}"
bind-key -r - split-window -v -c "#{pane_current_path}"

Fish version

> fish --version
fish, version 3.0.2

Thanks for the help!