I went looking for other map errors in the later books. Although the map 12-4 error I posted previously is the only one I could find in book 3, book 4 has several errors--only one of which significantly impacts its use: map 17-4 (presenting interior areas of "The Basalt Tower") seems to be missing entirely. Other errors involve mislabeling but do not otherwise impact use. Map 17-2 identifies itself incorrectly in the graphic as map 12-2. Map 17-7 is captioned incorrectly as map 17-5. I found these errors in the PDF of book 4 released Nov 2025. Being a digital-only backer, I do not know if they're present in the printed copies shipped out.