[devcontainers] Extension does not accept .devcontainer.json as a symlink

I have a few common configuration files stored in a submodule in my repo, among them is a devcontainer config file.
If i link to this file (ln -sr <sub-module>/devcontainer.json <repo-root>/.devcontainer.json) and open VS Code I don't get the "Folder contains a Dev Container configuration file"-popup. It does however work to create the symlink inside a .devcontainer-folder (ln -sr <sub-module>/devcontainer.json <repo-root>/.devcontainer/devcontainer.json).

To sum up:
✅ File named .devcontainer.json: Works
✅ File named .devcontainer/devcontainer.json: Works
✅ Symlink named .devcontainer/devcontainer.json: Works
❌ Symlink named .devcontainer.json: Doesn't work