PDF Document Editable NotFoundHttpException


Hey guys

We just updated a project to Pimcore 5.4.4 from 5.3.1 and struggling now with the PDF Document Editable.
All content and scripts are added properly but the thumbnails fail with the following exception:
NotFoundHttpException - Thumbnail with name ‘auto_67c701f7a5433841097b3ccddba730b9’ doesn’t exist

It seems as the auto thumbnail pipe was removed by the new Pimcore version as all given requirements are met.

Did anyone face the same problem?
I’m greatful for any advice.