E749: Empty buffer error in ftdetect/nftables.vim

[kevinoid]

After installing vim-nftables (with git clone https://github.com/egberts/vim-nftables.git ~/.vim/pack/all/start/vim-nftables), running Vim 9.1.709 produces the following errors:

Error detected while processing /home/kevin/.vim/pack/all/start/vim-nftables/ftdete    line    1:
E749: Empty buffer
line    2:
E488: Trailing characters: Detect file type by use of shebang: # Detect file type b
line   11:
E488: Trailing characters: Detect file type by use of shebang:     # Detect file ty
line   14:
E488: Trailing characters: Detect file type by its filetype:     # Detect file type    Press ENTER or type command to continue

Similarly, running NVIM 0.9.5 produces:

Error detected while processing /usr/share/nvim/runtime/filetype.lua:
E5113: Error while calling lua chunk: vim/_editor.lua:341: /usr/share/nvim/runtime/file
type.lua..nvim_exec2() called at /usr/share/nvim/runtime/filetype.lua:0../home/kevin/.v
im/pack/all/start/vim-nftables/ftdetect/nftables.vim, line 1: Vim(#):E749: empty buffer

stack traceback:
        [C]: in function 'nvim_exec2'
        vim/_editor.lua:341: in function 'cmd'
        /usr/share/nvim/runtime/filetype.lua:36: in main chunk
Press ENTER or type command to continue

I believe the error is caused by # characters used for comments instead of ", which is only supported by Vim9 Script. The regression was introduced in af699d8.

Thanks for maintaining this package!
Kevin