Cannot open multiple terminals while in terminal mode

### Current Behavior

The current setup allow me to spawn multiple terminals, just like expected, meaning that `1` and `2` opens terminal 1 and 2 respectively. The current issue is that doing `1` and then `2`, the terminal does not split in two, but instead closes the terminal, same as doing ``.

Is I do this with command `:ToggleTerm 1` and `:ToggleTerm 2` it works like expected.

### Expected Behavior

The expected behaviour is that spawning a second terminal, the screen will split the screen of the first terminal and open the second one.

### Steps To Reproduce

Using lazyvim with lunarvim, this is the current relevant config:

```
lvim.keys.normal_mode[""] = false
lvim.builtin.terminal.open_mapping = ""
lvim.builtin.terminal.active = true

{
"akinsho/toggleterm.nvim",
config = function()
require("toggleterm").setup({
open_mapping = [[]],
terminal_mappings = true,
direction = "horizontal",
size = 30,
})
end
}
```

### Environment

```Markdown
- OS: MacOS Sonoma 14.1.1 (23B81)
- neovim version: 0.9.0
- Shell: zsh
```

### Anything else?

_No response_