The last way is not correct!
I have found that ONLY the URL (href) has to be coded following RFC 3986.
Therefore is should be coded in a textarea field of the panel like
(link: https://de.wikipedia.org/wiki/Angeln_%28Fischfang%29 text: Angeln_(Fischfang))
which reders to
<a href="https://de.wikipedia.org/wiki/Angeln_%28Fischfang%29">Angeln_(Fischfang)</a>
Hint:
Look for the different coding, e.g. “%28
” and “(
” for the “(”.
Good luck!