To summarize: What you are likely looking for is the web novel source material, or you have been misled by a fake listing. The manga is healthily progressing through its monthly releases, currently in the late 70s to early 80s in chapter count.
Currently around Chapter 78–84 . Chapter 78 is titled "The Fortress" and focuses on Maomao being held hostage and Lakan investigating evidence to save her. manga+kusuriya+no+hitorigoto+raw+chapter+782