usage of asset_filter breaks target

[leapfog]

With the following simple config file

[global]
  target = "~/bin"
  upgrade_only = true

the command eget neovim/neovim downloads the appimage and places it in ~/bin.

But when I add

["neovim/neovim"]
   asset_filters = "nvim.appimage"

the download ends up in ./ (i.e. the current directory).