Drupal once usage for dialog:beforeclose event binding

Problem/Motivation

When configuring a patternkit block with existing layout, there is JS console error. Subsequently, I'm unable to save changes the the patternkit block configuration.

The dialog:beforeclose event binding here, appears to implement Drupal's once incorrectly.

This Drupal core change record → states

You can only use once with objects that are instances of Element, which means you can not use it with the document or window object.

.

And the code uses the window object.

$(once('patternkit-jsoneditor-off-canvas', window)).on('dialog:beforeclose', (event, dialog, $element) => {

Steps to reproduce

I have not yet been able to reproduced this outside of my implementation using the Patternkit Example with Drupal core only.

TBD

Uncaught TypeError: The element must be an instance of Element
    u once.js:122
    c once.js:189
    c once.js:188
    a once.js:278
    augmentedOnce jQuery
    attach patternkit.jsoneditor.js:1353
    attachBehaviors drupal.js:24
    attachBehaviors drupal.js:21
    insert ajax.js:493
    jQuery 2
    insert ajax.js:491
    openDialog dialog.ajax.js:66
    commandExecutionQueue ajax.js:374
    promise callback*Drupal.Ajax.prototype.commandExecutionQueue/< ajax.js:371
    commandExecutionQueue ajax.js:370
    success ajax.js:395
    success ajax.js:207
    jQuery 6
    eventResponse ajax.js:296
    Ajax ajax.js:247
    jQuery 8
    Ajax ajax.js:241
    ajax ajax.js:105
    bindAjaxLinks ajax.js:134
    bindAjaxLinks ajax.js:117
    <anonymous> contextual.js:150
    jQuery 7
    initContextual contextual.js:77
    attach contextual.js:108
    setTimeout handler*attach/< contextual.js:107
    attach contextual.js:104
    attachBehaviors drupal.js:24
    attachBehaviors drupal.js:21
    <anonymous> drupal.init.js:24
    listener drupal.init.js:14
    domReady drupal.init.js:20
    <anonymous> drupal.init.js:23
    <anonymous> drupal.init.js:26

Proposed resolution

Update the Drupal once usage following the examples in Drupal core change record.

Per the Drupal core change record → ,

If you need a page-level element please use 'html' or 'body' as the selector used in the once call: once('my-global-once', 'html').

There's this example in the change record.
$(once('vertical-tabs-fragments', 'body')).on()

Remaining tasks

TBD

User interface changes

None

API changes

None

Data model changes

None