New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {
  rows = [...'abcdefghijklmnopqrstuvwxyz']

	@action changeRow(row, index, { target }) {
    this.rows.replace(index, 1, [target.value])
  }

  @action updateRow(row, id, div) {
    if (div.parentNode instanceof DocumentFragment) {
      console.error(`Ran update on destroyed row (${row}) with id "${id}":`)
      console.dir(div)
    }
  }
}

templates.application\.hbs

<div style="height: 100px; overflow: auto;">
	<VerticalCollection
  		@items={{this.rows}}
      @estimateHeight={{16}}
      as |row index|>
    {{#let (concat 'row-' row) as |id|}}
    	<div id={{id}}
      		{{did-update (fn this.updateRow row id) this.rows}}>
				<input value={{row}}
          {{on 'change' (fn this.changeRow row index)}} />
      </div>
    {{/let}}
	</VerticalCollection>
</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
	  "@ember/render-modifiers": "1.0.2",
    "@glimmer/component": "1.0.0",
    "@html-next/vertical-collection": "3.0.0-1"
  }
}