‘event’ is not returning an object representing the document for ‘onDocumentDeleted’ function in Google Cloud Functions 2nd gen

I am trying to deploy a onDocumentDeleted Google Cloud Function (2nd gen) but when I delete a document in my application, the event I get is not correct and I can’t get the snapshot from it.

My function:

import type { QueryDocumentSnapshot } from 'firebase-admin/firestore';
import {
    FirestoreEvent,
    onDocumentDeleted,
} from 'firebase-functions/v2/firestore';

export const myFunction = onDocumentDeleted(
  'myDocuments/{myDocumentID}',
  async (
    event: FirestoreEvent<
      QueryDocumentSnapshot | undefined,
      { myDocumentID: string }
    >,
  ): Promise<void> => {
    console.log('Event is:', JSON.stringify(event));
    const snapshot = event.data as QueryDocumentSnapshot<MyDocument>;
    console.log('Snapshot is:', JSON.stringify(snapshot));
  },
);

My deploy script:

FUNCTION_NAME=my-function
ENTRY_POINT=myFunction
PROJECT_ID=my-project

gcloud functions deploy ${FUNCTION_NAME} \
--gen2 \
--runtime=nodejs20 \
--region=europe-west3 \
--trigger-location=eur3 \
--source=./deploy \
--entry-point=${ENTRY_POINT} \
--project=${PROJECT_ID} \
--env-vars-file=.env.stage.yaml \
--trigger-event-filters=type=google.cloud.firestore.document.v1.deleted \
--trigger-event-filters=database="(default)" \
--trigger-event-filters-path-pattern=document="myDocuments/{myDocumentID}" \
--allow-unauthenticated \

Result:

Event is: {“0″:18,”1″:151,”2″:232,”3″:1,”4″:10,”5″:60,”6″:112,”7″:114,”8″:111,”9″:106,”10″:101,”11″:99,”12″:116,”13″:115,”14″:47,”15″:110,”16″:105,”17″:114,”18″:111,”19”:45,”2…

Snapshot is: undefined