[NTG-context] background of \typing fills column

Hi, I finally wanted to attack CG journal 2019 again and stumble upon this error: If an article contains several \starttyping ... \stoptyping examples with a textbackground, it sometimes fills the whole column (pagecolumns). It doesn’t occur if the "typing" is at top or bottom of the column or even breaks. It’s the same with MkIV and LMTX. I’ll try to come up with a MWE, but perhaps you already know what’s wrong? Here’s the PDF: https://sedna.fiee.net/f/a75380127d7b4f17a940/ Best, Hraban