Error when trying to use `hover_symbol`

[aeternvs]

Description

When trying to display hover information from the provider in the sidebar (via Ctrl-Space), the following error message appears and no hover information is shown:

E5108: Error executing lua: vim/shared.lua:0: s: expected string, got table
stack traceback:
        [C]: in function 'error'
        vim/shared.lua: in function 'validate'
        vim/shared.lua: in function 'gsplit'
        vim/shared.lua: in function 'split'
        ...vim/lazy/outline.nvim/lua/outline/providers/nvim-lsp.lua:242: in function <...vim/lazy/outline.nvim/lua/outline/providers/nvim-lsp.lua:214>
        ...re/nvim/lazy/outline.nvim/lua/outline/providers/init.lua:37: in function 'method'
        ...cal/share/nvim/lazy/outline.nvim/lua/outline/sidebar.lua:127: in function <...cal/share/nvim/lazy/outline.nvim/lua/outline/sidebar.lua:127>

This happens with multiple filetypes/providers (C++/clangd, Python/pyright, Lua/lua_ls).

Neovim setup

• Neovim version: 0.11.4
• Outline.nvim version: 6b62f73
• Neovim distro (if applicable): n/a
• Plugin manager: lazy.nvim

Config: The issue also occurs with an empty (default) config.