Bug - Neovim 0.11 - :BufstopFast - E474: Invalid argument: fileformat=

[andis-sprinkis]

1. When issuing the command :BufstopFast an error message appears:

   

2. Upon dismissing the error message, the Bufstop window does open:
   

This happens on stock Neovim 0.11 configuration on Arch Linux, with the Bufstop plugin repository files copied into ~/.config/nvim, as well as on a very custom configuration where the plugin is loaded using the Lazy.nvim plugin manager.