Gallery addon ckeditor issue

Running the latest version of the Gallery addon, on the "Album options" tab I noticed that one of my textarea fields wasn't being displayed as an instance of CKEditor:

<perch:gallery id="omschrijving" type="textarea" label="Omschrijving" html="true" editor="ckeditor" />

Looking at the source of the page the required JS isn't being loaded in inc/btm.php, so now I load a copy of this file in the app with the required ckeditor included manually, which works fine.

Any idea if I did something wrong or if there's an issue with the updated version?

Diagnostics:

Dianostics report
HEALTH CHECK

Perch is up to date
PHP 5.6.2 is up to date
MySQL 5.5.38 is up to date
Image processing available
SUMMARY INFORMATION

Perch: 2.8.3, PHP: 5.6.2, MySQL: 5.5.38, with PDO
Server OS: Darwin, apache2handler
Installed apps: content (2.8.3), assets (2.8.3), categories (2.8.3), perch_forms (1.8.3), perch_gallery (2.8.6)
App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_forms', 'perch_gallery' );
PERCH_LOGINPATH: /site/admin
PERCH_PATH: /Users/joris/Repos/site/admin
PERCH_CORE: /Users/joris/Repos/site/admin/core
PERCH_RESFILEPATH: /Users/joris/Repos/site/admin/resources
Image manipulation: GD
PHP limits: Max upload 256M, Max POST 256M, Memory: 512M, Total max file upload: 256M
Resource folder writeable: Yes
HTTP_HOST: localhost:8888
DOCUMENT_ROOT: /Users/joris/Repos
REQUEST_URI: /site/admin/core/settings/diagnostics/
SCRIPT_NAME: /site/admin/core/settings/diagnostics/index.php