Problem with musical search tool

In Trm0047m (but I assume it happens with other pieces as well), if you search for the pitch G several syllables in the text underlay of the basso are replaced by @--see screenshot.
![screenshot 2018-07-28 07 45 46](https://user-images.githubusercontent.com/26633719/43376940-86aadf90-938b-11e8-9889-1fd4bed79749.png)

