Found this problem while looking through all the possible sourcecode variations on Module:Yesno across all the wikis.
In hiwiktionary exist 2 modules, called yesno and Yesno, where the first one simply calls another one. The problem is that this call does not appear in Templatelinks table, where all the transclusions should be. Testing the script on the wiki shows that it seems to be working nevertheless.
Some code examples, which show this problem, can be found in PAWS notebook.