Hm, the plugin created the yearly post again in both of my self-hosted forums tonight.
Is this because I changed to topic title (from 2022: das Jahr im Rückblick to 2022: Das Jahr im Rückblick) and/or added a tag or because there is a bug in the plugin?
AFAIK because you changed the tittle. Tags dont affect.
Okay thank you. I now changed the translation string to what I changed manually yesterday. What do you think, will it create a new topic again tonight?
Year ago that happened to me. What is the situation now… well, you’ll see 
Okay. 
I will be back here tomorrow with an update. I hope that the plugin is not only using the translations but also cares about the title in the translation when checking if it still needs to run.
Okay, no more new Yearly post. So it seems that the plugin checks if there’s a post with the exact title including translations. 