`create_buffer` calls `Buffer::local` which sets `file` to `None` [here](https://github.com/zed-industries/zed/blob/f2761bd0ab6554c72dfc7ba9c9733e0b17c79853/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