> The issue only involves small letters, because the compression scheme breaks up the image into patches and then tries to identify visually similar blocks and reuse them. Certain settings can allow for small blocks of text to be deemed identical, within a threshold, and thus replaced. That's all. Coincidence, not semantic awareness.

Copiers very commonly copy printed material. This sort of algorithm makes it likely that sometimes one character will be replaced by another, so it is a bad algorithm for the job.

Xerox should have known better.