I do have a page with many contents. Also references to external contents. I wanted to add such a link:
<a href="https://ttvbw.click-tt.de/cgi-bin/WebObjects/nuLigaTTDE.woa/wa/tournamentCalendarDetail?federation=BaTTV&tournament=396129" target="_blank" rel="noopener noreferrer">Badische Meisterschaften</a>
Copy paste in the source editor view at the desired place works.
Clicking button "publish" gives the red banner message "publishing not possible".
&" is re-interpreted into
& in the ref-string. Removing that additional link I can publish again. What am I doing wrong putting a query link ?