FBI Sorry, there were some changes made in beta 10 which I also changed in the extension to use less resources. https://flarum.org/docs/extend/update-b10.html
It's about the following change in beta 10:
The formatContent() method of Flarum\Post\CommentPost can now be called without an HTTP request instance, e.g. when rendering a post in an email template.
You can revert my changes in the extension. Then you need to add $this->parent->getServerRequest() again on multiple places in the code.

010101 tankerkiller125 Also, this update should fix the saving problems at the dashboard, are you able to test this?