`tmux` <leader>+<key> bindings stop working inside `opencode`

[jamierpond]

When I'm inside opencode I can't use keybindings like this within tmux. I just end up typing lots of l, k etc.
Expected behaviour, is that these keybindings keep working.

tmux.conf

# vim-like pane switching
bind -r ^ last-window
bind -r k select-pane -U
bind -r j select-pane -D
bind -r h select-pane -L
bind -r l select-pane -R

➜  dir git:(branch) opencode --version
v0.0.55