[Self-hosted]: Login V2 not working for localhost on Safari (macos, iOS Simulator)

Has anyone managed to log in via the Safari browser using the Docker Compose setup on localhost? The Flutter iOS implementation also doesn’t work on the simulator. It seems that the session cookie is not being sent to http://localhost:3000/ui/v2/login/password after entering the login name. This results in the error messages “Could not get the context of the user…” and “Could not verify password…”.
Firefox works fine!