When a user pastes Wikitext from another article, VisualEditor does not detect this as wiki markup but masks it with nowiki tags, which makes for an unusable, hard-to-clean-up mess: [[ https://de.wikipedia.org/w/index.php?title=Graf_Zeppelins_Boote,_Schiffe_und_schwimmende_Hallen&oldid=160565999 | Example ]].
According to other users on de-wp this occurs frequently since VE was enabled as the default for new users, I therefore already [[ https://de.wikipedia.org/w/index.php?diff=160656234&oldid=160609239&title=Wikipedia:Bearbeitungsfilter/Antr%C3%A4ge | requested a new abuse filter to track it ]].
(I searched and could only find semi-related bugs, so [[ https://de.wikipedia.org/w/index.php?diff=160656476&oldid=160656387&title=Wikipedia:Fragen_zur_Wikipedia&curid=6977098 | per AKlapper's recommendation ]] I filed this new bug. )