So i followed this tutorial (https://devdocs.magento.com/guides/v2.4/ui_comp_guide/components/wysiwyg/add-custom-editor/) from Magentos own devdocs.
The problem is, that the editor wont save any changes. But when i press source mode and make any changes, then it saves the data.
I have no idea what i can be and have been stucked with it for 3 days now