In the following HTML-fragment:

<h3>Grundlegende Funktionen[Bearbeiten | Quelltext bearbeiten]</h3>

With the following keyphrase forms:

[ [ 'wordpress\\.org' ], [ 'geschichte' ], [ 'funktionen' ] ]

The word "Funktionen" is not recognized.
Adding a space between "Funktionen" and the square bracket afterwards does lead to an identification of the word.

I would argue that it should recognize it as an occurence of the keyword.

This bug happens regularly in our full text specs, since we make heavy use of Wikipedia articles.
(They use this format for their headings).