ONLYOFFICE does not work when editing files from group folder through a share link

[schierla]

I'm using Nextcloud 13.0.4 with OnlyOffice 1.3.0, Group Folders 1.2.2 and File Sharing 1.5.0.
In general, ONLYOFFICE works for editing files, from individual folders as well as from group folders.

However, when I use the share by email feature with a file on a group folder (and enable "can write"), ONLYOFFICE does not open, but ends with a HTTP error 500 when accessing index.php/apps/onlyoffice/ajax/config/1273027.

In the log, the corresponding exception is:
{
"Exception":"Error",
"Message":"Call to a member function getUID() on null",
"Code":0,
"Trace":"
#0 [internal function]: OCA\Onlyoffice\Controller\EditorController->config(1273027, '[TOKEN]')
#1 /snap/nextcloud/7658/htdocs/lib/private/AppFramework/Http/Dispatcher.php(161): call_user_func_array(Array, Array)
#2 /snap/nextcloud/7658/htdocs/lib/private/AppFramework/Http/Dispatcher.php(91): OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Onlyoffice\Controller\EditorController), 'config')
#3 /snap/nextcloud/7658/htdocs/lib/private/AppFramework/App.php(115): OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Onlyoffice\Controller\EditorController), 'config')
#4 /snap/nextcloud/7658/htdocs/lib/private/AppFramework/Routing/RouteActionHandler.php(47): OC\AppFramework\App::main('OCA\Onlyoffice\...', 'config', Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
#5 [internal function]: OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
#6 /snap/nextcloud/7658/htdocs/lib/private/Route/Router.php(297): call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
#7 /snap/nextcloud/7658/htdocs/lib/base.php(999): OC\Route\Router->match('/apps/onlyoffic...')
#8 /snap/nextcloud/7658/htdocs/index.php(42): OC::handleRequest()
#9 {main}",
"File":"/var/snap/nextcloud/7658/nextcloud/extra-apps/onlyoffice/controller/editorcontroller.php",
"Line":430
}

It looks like ONLYOFFICE fails to determine the file owner of the group folder file. When I share the file as read-only, or when I share it from a individual folder, ONLYOFFICE works fine.