[Bug]: Tabline hidden by interaction with scope.nvim

### Is there an existing issue for this?

- [X] I have searched the existing issues

### What happened?

While using scope.nvim for tab-scoped buffers and option `always_show_bufferline = false`, switching to a tab with one buffer hides the tabline.

### What did you expect to happen?

BufferLine to stay/appear due to multiple tabs existing.

### Config

LazyVim defaults + overrides.

LazyVim

```lua
{
"akinsho/bufferline.nvim",
event = "VeryLazy",
keys = {
{ "bp", "BufferLineTogglePin", desc = "Toggle Pin" },
{ "bP", "BufferLineGroupClose ungrouped", desc = "Delete Non-Pinned Buffers" },
{ "bo", "BufferLineCloseOthers", desc = "Delete Other Buffers" },
{ "br", "BufferLineCloseRight", desc = "Delete Buffers to the Right" },
{ "bl", "BufferLineCloseLeft", desc = "Delete Buffers to the Left" },
{ "", "BufferLineCyclePrev", desc = "Prev Buffer" },
{ "", "BufferLineCycleNext", desc = "Next Buffer" },
{ "[b", "BufferLineCyclePrev", desc = "Prev Buffer" },
{ "]b", "BufferLineCycleNext", desc = "Next Buffer" },
{ "[B", "BufferLineMovePrev", desc = "Move buffer prev" },
{ "]B", "BufferLineMoveNext", desc = "Move buffer next" },
},
opts = {
options = {
-- stylua: ignore
close_command = function(n) LazyVim.ui.bufremove(n) end,
-- stylua: ignore
right_mouse_command = function(n) LazyVim.ui.bufremove(n) end,
diagnostics = "nvim_lsp",
always_show_bufferline = false,
diagnostics_indicator = function(_, _, diag)
local icons = require("lazyvim.config").icons.diagnostics
local ret = (diag.error and icons.Error .. diag.error .. " " or "")
.. (diag.warning and icons.Warn .. diag.warning or "")
return vim.trim(ret)
end,
offsets = {
{
filetype = "neo-tree",
text = "Neo-tree",
highlight = "Directory",
text_align = "left",
},
},
---@param opts bufferline.IconFetcherOpts
get_element_icon = function(opts)
return LazyVim.config.icons.ft[opts.filetype]
end,
},
},
config = function(_, opts)
require("bufferline").setup(opts)
-- Fix bufferline when restoring a session
vim.api.nvim_create_autocmd({ "BufAdd", "BufDelete" }, {
callback = function()
vim.schedule(function()
pcall(nvim_bufferline)
end)
end,
})
end,
}
```

Overrides

```lua
return {
"akinsho/bufferline.nvim",
dependencies = { { "tiagovla/scope.nvim", config = true } },
}
```

### Additional Information

Overriding with `always_show_bufferline = true` does not seem to prevent the problem.

### commit

99337f6 (v4.6.1)