Mongoose pre and post hooks do not work on models created with Model.discriminator

I am using mongoose 6.1.5.

I have a collection containing multiple types of related documents. Here is parameter-descriptor-item.model.js

const mongoose = require('mongoose');

const { Schema } = mongoose;

/** @summary The schema for a parameter item */
const itemSchema = new Schema({
  _id: String,
  name: Object,
});

itemSchema.pre(/^find/, function () {
  // eslint-disable-next-line no-console
  console.log('item pre hit');
});

/** @summary The base model for all parameter items */
module.exports = mongoose.model('Parameters', itemSchema);

ParameterDescriptor model inherits from ParameterDescriptorItem. Here is parameter-descriptor.model.js

const mongoose = require('mongoose');
const ParameterDescriptorItem = require('./parameter-descriptor-item.model');

const { Schema } = mongoose;

/** @summary The schema for additional fields for a project */
const parameterSchema = new Schema({
  direction: {
    type: String,
    enum: ['in', 'out'],
    required: true,
  },
  default: {
    type: Number,
    required: true,
  },
  min: {
    type: Number,
    required: false,
  },
  max: {
    type: Number,
    required: false,
  },
  unit: {
    type: String,
    required: false,
  },
});

parameterSchema.pre(/^find/, function () {
  // eslint-disable-next-line no-console
  console.log('parameter pre hit');
});


/** @summary The model for a parameter descriptor */
module.exports = ParameterDescriptorItem.discriminator('Parameter', parameterSchema);

And here is code to test the use of pre hooks.

const ParameterDescriptorItem = require('./parameter-descriptor-item.model');
const ParameterDescriptor = require('./parameter-descriptor.model');

await ParameterDescriptorItem.find();
// console shows: 'item pre hit'
await ParameterDescriptor.find();
// there is nothing additional in the console. Neither the 'pre' hooks from
// ParameterDescriptorItem or ParameterDescriptor is called.

This is a significant issue for me. Is there a way to address it? Is there a way to add pre and post hooks to models created with Model.discriminator?