@schlawar Thanks for the hint. My editing requirements are completely fulfilled by #qpdfview and I don't need another fancy PDF-editor right now. In addition I use pdfarranger.
The editor does not recognize the highlighting done by #qpdfview and doesn't print it either. #evince does at least show the highlighted text but does print just the first highlighted text correctly. I mark the relevant texts with a red rectangle now. This works but that could probably be done with another tool as well.