Question Post Edit reason not working anymore after updating to 3.3.12

[Black Tiger]

I'd installed Post Edit Reason which was working fine. Until I updated to 3.3.12 and now it shows errors when editting a post so I had to temporarily disable it.
We're running php 8.3 by the way.

This is what the server log says:

• Error: Class "MMO\PostEditReason\XF\Service\Post\XFCP_Editor" not found
• src/addons/MMO/PostEditReason/XF/Service/Post/EditorService.php:5

#0 src/vendor/composer/ClassLoader.php(576): include()
#1 src/vendor/composer/ClassLoader.php(427): Composer\Autoload\{closure}('/home/satfun/do...')
#2 [internal function]: Composer\Autoload\ClassLoader->loadClass('MMO\\PostEditRea...')
#3 src/XF.php(410): spl_autoload_call('MMO\\PostEditRea...')
#4 [internal function]: XF::createAliasForClass('MMO\\PostEditRea...')
#5 src/XF/Extension.php(213): class_exists('MMO\\PostEditRea...')
#6 src/XF/App.php(3389): XF\Extension->extendClass('XF\\Service\\Post...', NULL)
#7 src/XF/App.php(1964): XF\App->extendClass('XF\\Service\\Post...')
#8 src/XF/Container.php(250): XF\App->XF\{closure}('XF\\Service\\Post...', Array, Object(XF\Container))
#9 src/XF/App.php(3554): XF\Container->create('service', 'XF\\Service\\Post...', Array)
#10 src/XF/Mvc/Controller.php(890): XF\App->service('XF\\Service\\Post...', Object(XF\Entity\Post))
#11 src/XF/Pub/Controller/PostController.php(73): XF\Mvc\Controller->service('XF\\Service\\Post...', Object(XF\Entity\Post))
#12 src/addons/MMO/PostEditReason/XF/Pub/Controller/PostController.php(16): XF\Pub\Controller\PostController->setupPostEdit(Object(XF\Entity\Post))
#13 src/XF/Pub/Controller/PostController.php(154): MMO\PostEditReason\XF\Pub\Controller\PostController->setupPostEdit(Object(XF\Entity\Post))
#14 src/addons/Snog/ForceSecure/XF/Pub/Controller/Post.php(18): XF\Pub\Controller\PostController->actionEdit(Object(XF\Mvc\ParameterBag))
#15 src/XF/Mvc/Dispatcher.php(364): Snog\ForceSecure\XF\Pub\Controller\Post->actionEdit(Object(XF\Mvc\ParameterBag))
#16 src/XF/Mvc/Dispatcher.php(266): XF\Mvc\Dispatcher->dispatchClass('XF:Post', 'Edit', Object(XF\Mvc\RouteMatch), Object(MMO\PostEditReason\XF\Pub\Controller\PostController), NULL)
#17 src/XF/Mvc/Dispatcher.php(121): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(MMO\PostEditReason\XF\Pub\Controller\PostController), NULL)
#18 src/XF/Mvc/Dispatcher.php(63): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#19 src/XF/App.php(2830): XF\Mvc\Dispatcher->run()
#20 src/XF.php(850): XF\App->run()
#21 index.php(23): XF::runApp('XF\\Pub\\App')
#22 {main}