GitConflictDetected not triggered by git alias

Sorry for being brief:

If neovim is started via a git alias `fix = "!${EDITOR} -p $(git diff --name-only --diff-filter=U)"` sometimes (I cannot tell when exactly) the `GitConflictDetected` autocommand is not triggered and therefore the plugin does not work. This happened to me while I was doing a git rebase.

It works if I run the command manually `nvim -p $(git diff --name-only --diff-filter=U)` but not via `git fix`.

I tried `https://github.com/tronikelis/conflict-marker.nvim` which does work with the alias.

Does someone have any idea how to solve this? I really like this plugin.