By @tobiasdiez

https://github.com/JabRef/jabref/blob/85acd73acbf94265a2816f5243f7f5fd917b3ed3/src/main/java/org/jabref/logic/bibtex/FieldContentParser.java#L30

Please extract these fields that should be treated as multilines to InternalBibtexFields (or a better location). Moreover, a few places still work with https://github.com/JabRef/jabref/blob/733da312471c3abab691d61eccee061962357e1c/src/main/java/org/jabref/model/entry/FieldName.java#L107 instead of comments. This should be changed too.