It's new to me that I as a USER have to provide you the developer with clues to how to fix YOUR application!
First of all, I provided you with all the information I could: Version Number and the fact that the problem did no longer exist after switching from german to UK WoW-Client.
Strangely enough with the newest Version 126.96.36.1996 the problem no longer exists so it seems to me that you found a clue to how to fix it.
Anyway the way you reacted will most certainly prevent me from ever posting some information on WAU errors ever again, thanks for your support.
Unfortunately the newest Version of WAU (188.8.131.524) doesn't recognize the german client correctly.
Even though WOW loads the old versions correctly, the WAU Client is still showing all addons with strikethru text as "old".
When switching from deDE client to enGB client the WAU client displays the addons correctly.