Buffer opens up with modifiable set to false

Installed the plugin using lazy as specified in the README. It looks as follows,

{
    'mikesmithgh/kitty-scrollback.nvim',
    enabled = true,
    lazy = true,
    cmd = { 'KittyScrollbackGenerateKittens', 'KittyScrollbackCheckHealth' },
    event = { 'User KittyScrollbackLaunch' },
    -- version = '*', -- latest stable version, may have breaking changes if major version changed
    -- version = '^4.0.0', -- pin major version, include fixes and features that do not have breaking changes
    config = function()
        require('kitty-scrollback').setup({
            {
                status_window = {
                    style_simple = true,
                },
                visual_selection_highlight_mode = 'kitty',
            },
        })
    end,
},

The relevant portion in kitty configuration is as follows,

# kitty-scrollback.nvim Kitten alias
action_alias kitty_scrollback_nvim kitten /Users/prayagmatic/.local/share/nvim/lazy/kitty-scrollback.nvim/python/kitty_scrollback_nvim.py

# Browse scrollback buffer in nvim
map kitty_mod+h kitty_scrollback_nvim
# Browse output of the last shell command in nvim
map kitty_mod+g kitty_scrollback_nvim --config ksb_builtin_last_cmd_output
# Show clicked command output in nvim
mouse_map ctrl+shift+right press ungrabbed combine : mouse_select_command_output : kitty_scrollback_nvim --config ksb_builtin_last_visited_cmd_output

When I use any of these keybindings, the nvim buffer opens up as expected. However, I can't modify anything since it opens up with modifiable set to false.

I have tried the following extra arguments to nvim,

--nvim-args -u /Users/prayagmatic/.config/kitty/init.lua: Use a different nvim configuration which is copied from the README.
--nvim-args --cmd "set modifiable" or its Lua equivalent
--nvim-args --clean --noplugin -n

In all the cases, it always starts with modifiable set to false. It only works when I toggle it manually after the buffer is opened.

I can't exactly pinpoint as to who's overriding this value. Is it possible that the kitten or the nvim plugin is forcefully overriding this value?

TIA.

mikesmithgh / kitty-scrollback.nvim

Buffer opens up with modifiable set to false #252