So, I use nixvim with home-manager on 2 devices, my PC and my Laptop. I use mostly the same configuration, just a few drivers are different.
On my PC everything works fine. On the Laptop I get very weird errors I could not find anything in any docs about. Hopefully a nix/neovim wizard knows more than me 
If this is not the correct forum, just let me know where to go to.
Fugitive:
Error detected while processing BufEnter Autocommands for "fugitive://*//"..function <SNR>71_Re
loadWinStatus[11]..<SNR>71_ReloadStatusBuffer[6]..fugitive#BufReadStatus[28]..BufEnter Autocomm
ands for "fugitive://*//"..function <SNR>71_ReloadWinStatus[11]..<SNR>71_ReloadStatusBuffer[6].
.fugitive#BufReadStatus[16]..BufReadPost Autocommands for "*":
Error executing lua callback: ...ped-0.9.1/share/nvim/runtime/lua/vim/filetype/detect.lua:485:
attempt to call upvalue 'getlines' (a nil value)
stack traceback:
...ped-0.9.1/share/nvim/runtime/lua/vim/filetype/detect.lua:485: in function <...ped-0.
9.1/share/nvim/runtime/lua/vim/filetype/detect.lua:484>
vim/filetype.lua: in function ''
vim/filetype.lua: in function 'match'
...-neovim-unwrapped-0.10.4/share/nvim/runtime/filetype.lua:14: in function <...-neovim
Telescope:
Error executing vim.schedule lua callback: ...Packages/start/fzf-lua/lua/fzf-lua/previewer/buil
tin.lua:260: attempt to call method 'redraw_preview_border' (a nil value)
stack traceback:
...Packages/start/fzf-lua/lua/fzf-lua/previewer/builtin.lua:260: in function 'populate_
preview_buf'
...Packages/start/fzf-lua/lua/fzf-lua/previewer/builtin.lua:280: in function ''
vim/_editor.lua: in function ''
vim/_editor.lua: in function <vim/_editor.lua:0>