Cannot read properties of undefined (reading 'onDidPaste')

[jcdarwin]

Description

After upgrading craftcms/ckeditor (3.0.0 => 3.8.3), I find that when I visit the settings page (either for an existing configuration, or for a new configuration), I don't see any toolbar items either in the top area (i.e. under "Drag toolbar items into the editor") or bottom area (the toolbar).

I notice that there is an error in the dev tools console:

jquery.js?v=1714800000:2 jQuery.Deferred exception: Cannot read properties of undefined (reading 'onDidPaste') TypeError: Cannot read properties of undefined (reading 'onDidPaste')
    at s.constructor.init (https://localhost.chinacapable.org.nz/cpresources/b22f9e9e/ckeconfig.js?v=1713667100:2:4289)
    at s.constructor.constructor (https://localhost.chinacapable.org.nz/cpresources/e6dedc42/garnish.js?v=1714800000:2:2989)
    at s.constructor (https://localhost.chinacapable.org.nz/cpresources/e6dedc42/garnish.js?v=1714800000:2:1243)
    at new s.constructor (https://localhost.chinacapable.org.nz/cpresources/e6dedc42/garnish.js?v=1714800000:2:1243)
    at HTMLDocument.<anonymous> (https://localhost.chinacapable.org.nz/manage/settings/ckeditor/new:803:23)
    at l (https://localhost.chinacapable.org.nz/cpresources/5a4f71eb/jquery.js?v=1714800000:2:30361)
    at c (https://localhost.chinacapable.org.nz/cpresources/5a4f71eb/jquery.js?v=1714800000:2:30663) undefined

jquery.js?v=1714800000:2 Uncaught TypeError: Cannot read properties of undefined (reading 'onDidPaste')
    at s.constructor.init (ConfigOptions.js:93:21)
    at s.constructor.constructor (Base.js:20:15)
    at s.constructor (Base.js:32:21)
    at new s.constructor (Base.js:32:21)
    at HTMLDocument.<anonymous> (new:803:23)
    at l (jquery.js?v=1714800000:2:30361)
    at c (jquery.js?v=1714800000:2:30663)

I can confirm that this error did not appear in the devtools console in the previously-installed version (3.0.0)

However, the toolbar in a ckeditor field in an entry looks OK.

Steps to reproduce

1. Upgrade to 3.8.3
2. Visit /admin/settings/ckeditor/new
3. See that there is no toolbar / toolbar icons showing, and the error mentioned above appears in the devtools console.

Additional info

• Craft version: 4.9.1
• PHP version: 8.2.10
• Database driver & version: MariaDB 10.6.12
• Plugins & versions: Asset Rev 7.0.0 CKEditor 3.8.3 Contact Form 3.1.0 Content Security Policy 2.1.1 Control Panel CSS 2.6.0 Cookies 4.0.1 Craft JWT Authorization 2.0.1 Digital Download 2.3.1 Dumper 5.0.1 Element API 4.1.0 Embedder 3.0.0 EntityDecode 3.0.0 Enupal Backup 2.2.0 Enupal Snapshot 2.0.2 Event Helper 2.1.0 Feedback Form 2.0.1 Feed Me 5.4.0 Freeform 5.1.17 Google reCAPTCHA 2.3.0 Help 5.0.0 Image Resizer 3.0.11 Mailgun 3.1.0 Password Policy 4.1.0 Plain ICS dev-craft4 Preparse Field 2.0.2 Registration Helper 2.9.1 Remote Backup 4.1.6 Resources Helper 2.0.2 Retcon 2.7.5 Sentry SDK 2.0.1 Sherlock 4.4.2 State Helper 2.0.1 Tag Manager 2.0.1 Twig Perversion 3.0.0 Two-Factor Authentication 3.3.7 Wordsmith 4.4.0