Tmux ctrl+backspace in nvim not work

[uzuki-P]

Terminal: ghostty 1.0.1-1.fc41
Shell: fish 3.7.0
nvim: v0.10.3
tmux: 3.5a

Outside tmux when on nvim and I press ctrl+v while in insert mode I got

• <BS> for backspace
• <S-BS> for shift+backspace
• <C-BS> for ctrl+backspace
• <M-BS> for alt+backspace

Inside tmux I got

• <BS> for backspace
• <BS> for shift+backspace
• ^H(greyed out) for ctrl+backspace
• <M-BS> for alt+backspace

I want to remap ctrl+backspace for ctrl+w in insert mode for delete whole word since ctrl+w is close tab on browser. Already trying to remap all of this on nvim, only alt+backspace works. Ctrl+bs only working outside tmux.

vim.api.nvim_set_keymap('i', '<M-BS>', '<C-W>', { noremap = false })
vim.api.nvim_set_keymap('i', '<C-BS>', '<C-W>', { noremap = true })
vim.api.nvim_set_keymap('i', '<C-?>', '<C-W>', { noremap = true })
vim.api.nvim_set_keymap('i', '<C-H>', '<C-W>', { noremap = true })
vim.api.nvim_set_keymap('i', '^H', '<C-W>', { noremap = true })

any ideas?

[nicm]

Have you got extended-keys set to on?

[uzuki-P]

I try with both extended-keys on and off on empty tmux (-f /dev/null). Still return ^H. Also paste with new line is broken when extended-keys is on so I set it off on my actual tmux config.

[nicm]

Is this still the case with latest master? If so, please show tmux server log (tmux -vv).