With the number of ARCs I’ve read (as opposed to proofs) I’ve really not found a lot of errors in the texts. However I spotted this one at just about the end of The City‘s ARC. I’ve double-checked it against the trade hard cover and it was fixed.
What I find most interesting is the typo itself, “11” instead of “ll”. I’ve mainly experienced this type of error when it comes to optical character recognition (OCR) post scanning a text, as opposed to manual transcription. It makes me wonder why OCR would have been done on what I assume was a manuscript that was submitted electronically.