`create_buffer` calls `Buffer::local` which sets `file` to `None` [here](https://github.com/zed-industries/zed/blob/f12981db32f9b936cd29e39ccc7f8a0b4e54cee1/crates/language/src/buffer.rs#L629). So there's no point in then immediately attempting to update maps that rely on `file` being present. Release Notes: - N/A