I’m using programs.neovim to set up my neovim, but having a small issue:
I’ve defined:

      customRC = ''
        source ~/.config/nvim/nix.vim
To import my full configuration, which works (the color scheme, custom commands etc. are all applied), except “filetype” definitions. E.g. I have following line in my config file:
autocmd FileType puppet setlocal shiftwidth=4 tabstop=4 sts=4 expandtab
which should set tab width to 4 spaces on puppet files, doesn’t work. Weird thing is, if I manually run :source ~/.config/nvim/nix.vim, it starts working 
Running :verbose setlocal ts? sts? et? sw? gives me:
  tabstop=2
        Last set from /nix/store/0aj802y5sb7sw1qjjk2z2gx2jwkdjggb-vimplugin-vim-puppet-2021-01-30/share/vim-plugins/vim-puppet/ftplugin/p
uppet.vim line 12
  softtabstop=2
        Last set from /nix/store/0aj802y5sb7sw1qjjk2z2gx2jwkdjggb-vimplugin-vim-puppet-2021-01-30/share/vim-plugins/vim-puppet/ftplugin/p
uppet.vim line 13
  expandtab
        Last set from /nix/store/0aj802y5sb7sw1qjjk2z2gx2jwkdjggb-vimplugin-vim-puppet-2021-01-30/share/vim-plugins/vim-puppet/ftplugin/p
uppet.vim line 15
  shiftwidth=2
        Last set from /nix/store/0aj802y5sb7sw1qjjk2z2gx2jwkdjggb-vimplugin-vim-puppet-2021-01-30/share/vim-plugins/vim-puppet/ftplugin/p
uppet.vim line 14
Which means my line is never evaluated on first load?
Could there be an ordering problem where “customRC” is applied, can I do something to dig further?
Related part of my config is here.
Thanks for any help/tip!