Zero width no-break space (U+FEFF) characters are removed from content passed to setContent, insertContent, and resetContent APIs.
Zero width no-break space (U+FEFF) characters in initial content are not loaded into the editor upon initialization.
Fixed
Specific HTML content containing unescaped text nodes caused mXSS when using undo/redo.
Specific HTML content containing unescaped text nodes caused mXSS when using the getContent and setContent APIs with the format: 'raw' option, which also affected the resetContent API and the draft restoration feature of the Autosave plugin
Note a similar update is required for tiny6 and joomla5 but I cant create it due to this bug #42356