Translations are not properly used when using livetable source for livedata

How to reproduce:

According to the documentation of live data, I used the following macro call to add a livetable for the Movies source (the Movies demo application shipped with the Help application):

{{liveData id="films" properties="longText1,doc.title,staticList1,date1,databaseList1,boolean1,_actions" showPageSizeDropdown="false" source="liveTable" sourceParameters="className=Help.Applications.Movies.Code.MoviesClass&'translationPrefix=movies.livetable."}}{{/liveData}}

Also, I added a new movie in the movies, containing just a title and no values for the columns.

Expected result:
The Movies application entries display with - as an empty value display, as they do in the movies livetable from the movies application home:

Actual result:
The Movies application entries display but instead of the - for the empty value, there is a piece of code and some translations seem to be missing (for the doc.title, for example):