Mongoose Transaction 1 has been committed error

I am trying to have two operations under a transaction.

const instance = new Model(data);
const session = await mongoose.startSession();

await session.withTransaction(async () => {
  await Model.updateOne(
    filterQuery,
    updateQuery,
    { session }
  );
  instance = await instance.save({ session });
});

await session.endSession();

This part of the code is working fine. But the problem is, I also have a post save hook, which updates some field of the saved instance.

ModelSchema.post('save', (doc, next) => {
  const instance = this;
  instance.field = updatedValue();
  instance.save((err) => {
    if (err) log(err);
    next();
  });
});

The save operation on the hook fails and raises MongoError: Transaction 1 has been committed. I am confused as this operation was not included in the session. Is there any workaround to avoid this error and have the save operation in post save hook?