Why are statistics charts broken on a wiki page?

Statistics charts such as artifact statistics, task statistics, FRS statistics and document statistics, when added to a wiki page, do not get displayed because the relevant markup formats [sf:artifactStatistics], [sf:taskStatistics], [sf:frsStatistics] and [sf:documentStatistics] have been deprecated from TeamForge 8.1 and later.

So, if you try to create a wiki page with these values, instead of displaying the charts, the following error messages are displayed:

For task charts, "The Task Statistics are discarded."
For all the other statistics charts, "The Statistics charts are deprecated viewing from Wiki. It can be accessible from Project Home Page."