I think it is fine. My suggestion would be that you edit your current answer and indicate on top that it covers errata for chapters 1-9, say. On top of your new answer, you could indicate that it covers errata for chapters 10-blah, and that you are posting it as a separate answer to increase ease of search (and maybe also mention how the large size was making it difficult to edit the file efficiently). You can then repeat the process if this second answer ends up ballooning in size as well.
Although I don't feel it would be a big deal anyway, I think it would actually be less useful to have a separate entry per each chapter, since the overabundance of answers may make the page look cluttered and disorganized, which is in part the opposite of your goal, and may lead to duplication of effort, with other people posting answers that list errata you already had or were to include, rather than having them all in a single place.
(I imagine you are not opposed to others editing your answers to add further errata you may have missed in chapters you already have listed.)