Error creating InteractiveVideo when Opencast is activated in the plugin config

[mhilbert]

After fixing the PHP 8.0 problems I get the following error when trying to create a new InteractiveVideo object (tested with ILIAS 8.9, InteractiveVideo 3.5.2 and PHP 8.0.30):

Error thrown with message "Typed property ilCtrl::$structure must not be accessed before initialization"

Stacktrace:
#19 Error in /path/to/htdocs/ilias/Services/UICore/classes/class.ilCtrl.php:354
#18 ilCtrl:saveParameterByClass in /path/to/htdocs/ilias/Services/UICore/classes/class.ilCtrl.php:343
#17 ilCtrl:saveParameter in /path/to/htdocs/ilias/Services/Object/classes/class.ilObject2GUI.php:182
#16 ilObject2GUI:__construct in /path/to/htdocs/ilias/Services/Repository/PluginSlot/class.ilObjectPluginGUI.php:58
#15 ilObjectPluginGUI:__construct in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/classes/class.ilObjInteractiveVideoGUI.php:43
#14 ilObjInteractiveVideoGUI:__construct in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/VideoSources/plugin/InteractiveVideoOpenCast/class.ilInteractiveVideoOpenCastGUI.php:279
#13 ilCtrl@anonymous�/path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/VideoSources/plugin/InteractiveVideoOpenCast/class.ilInteractiveVideoOpenCastGUI.php:254$10:getLinkTargetByClass in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/VideoSources/plugin/InteractiveVideoOpenCast/class.ilInteractiveVideoOpenCastGUI.php:325
#12 ilInteractiveVideoOpenCastGUI:createCtrlFake in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/VideoSources/plugin/InteractiveVideoOpenCast/class.ilInteractiveVideoOpenCastGUI.php:59
#11 ilInteractiveVideoOpenCastGUI:getForm in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/classes/class.ilObjInteractiveVideoGUI.php:1504
#10 ilObjInteractiveVideoGUI:appendFormsFromFactory in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/classes/class.ilObjInteractiveVideoGUI.php:985
#9 ilObjInteractiveVideoGUI:initCreateForm in /path/to/htdocs/ilias/Customizing/global/plugins/Services/Repository/RepositoryObject/InteractiveVideo/classes/class.ilObjInteractiveVideoGUI.php:971
#8 ilObjInteractiveVideoGUI:initCreationForms in /path/to/htdocs/ilias/Services/Object/classes/class.ilObjectGUI.php:618
#7 ilObjectGUI:createObject in /path/to/htdocs/ilias/Services/Object/classes/class.ilObject2GUI.php:618
#6 ilObject2GUI:create in /path/to/htdocs/ilias/Services/Repository/PluginSlot/class.ilObjectPluginGUI.php:163
#5 ilObjectPluginGUI:executeCommand in /path/to/htdocs/ilias/Services/UICore/classes/class.ilCtrl.php:199
#4 ilCtrl:forwardCommand in /path/to/htdocs/ilias/Services/Repository/classes/class.ilRepositoryGUI.php:243
#3 ilRepositoryGUI:show in /path/to/htdocs/ilias/Services/Repository/classes/class.ilRepositoryGUI.php:223
#2 ilRepositoryGUI:executeCommand in /path/to/htdocs/ilias/Services/UICore/classes/class.ilCtrl.php:199
#1 ilCtrl:forwardCommand in /path/to/htdocs/ilias/Services/UICore/classes/class.ilCtrl.php:174
#0 ilCtrl:callBaseClass in /path/to/htdocs/ilias/ilias.php:24